- Archie: "Betty was so against us not being in the same grade. And she took it upon herself to tutor me every single day."
- Veronica: "In the second grade?"
- Archie: "Yeah. Anyway, when I passed, thanks to Betty, I kissed her, and I asked her to marry me. She was like “Oh, little Archie, we’re too young. Ask me when we’re 18 and I’ll say yes."
- ―Archie talking to Veronica about his childhood memories with Betty[src]
They've always been close friends, but secretly, Betty harbored romantic feelings towards him, leaving their friendship strained as Archie doesn't feel the same way.
After Betty admitted her feelings for Archie, things were complicated between the two, but they were able to return to being friends.
Archie and Betty have been next-door neighbors since they were four years old, and have always been in the same school, grade, and classes together, ever since they could remember. When they were in the second grade, Archie was falling behind in reading and he would have been held back another year. Hating the idea of them being in different grades, Betty tutored Archie every day after school. He was later able to move up a grade with Betty.
Young Archie was so ecstatic that he kissed and proposed to Betty, but she turned him down as they were too young for marriage. However, she told him to ask her when they were eighteen and she would say yes.
The two best friends, Archie and Betty, had a date at Pop's Chock'lit Shoppe where they reunited after spending the summer apart. Whilst Archie told her about his newfound desire to pursue music as a career, Betty hoped to reveal the romantic feelings she harbored for him. However, as she was on the brink of confessing her love for him, Veronica came in at the wrong time, distracting Archie's attention from Betty's confession. Betty decided to stay silent about her feelings upon noticing how intrigued he was with this new arrival in town.
The next day, Veronica, upon hearing of Betty's interest in Archie, encouraged Betty to ask him to the back-to-school dance, and she did. At the semi-formal, Betty and Archie were on the dance floor, when she confessed how she'd been imagining them as a "power couple". He didn't really give her the reply she was hoping for. This upset Betty that he couldn't even think of them being more than just friends. Archie really did like Betty, but he thought he could never live up to her expectations and believed she was too perfect for him. Later on at the after-party, Cheryl decided to stir up trouble by gathering everyone to play Seven Minutes in Heaven. Cheryl forced Archie and Veronica to go into the closet for seven minutes. Veronica gave into temptation and kissed Archie. When Betty found out about this, she was very upset, even though Veronica ended up regretting it. Betty left the party in distress, and Archie chased after her until he got to her house. Betty tearfully asked Archie if he loved her at all, to which Archie replies that he does, but he will never feel worthy enough to date her. Archie eventually told Betty that he "couldn't give her the answer she wants", and Betty finally retreated to her home.
Archie became torn when news got out about Jason Blossom's death by gunshot, as he and Miss Grundy had heard a gunshot when they were together at the Sweetwater shore. However, telling the police about it would mean that Archie would most likely have to tell them about his and Grundy's relationship. He tried to talk to Betty, but exhausted and crestfallen over his rejection, she dismissed him through text. Betty eventually came around and decided that whether Archie reciprocated her feelings or not, Betty still wanted them to be friends. However, while listening to one of Archie's songs, Betty reminisced about the events of the weekend and fled in tears. Archie tried to console her, but Betty once again dismissed him, as her heartbreak was too recent to handle in front of him. Over the course of the episode, Betty resents both Archie for rejecting her feelings and Veronica for kissing him at the party and siding with Archie. After a tense encounter with Cheryl Blossom, however, Betty agreed with Veronica: Archie simply did not return her affections, and Betty shouldn't be mad at him because of it. The end of the episode has the four main characters at the Chock'lit Shoppe, finally on good terms.
Once she discovered that Archie and Grundy have been in a relationship, Betty was alarmed and tried to talk Archie out of it. Betty's suspicion on Miss Grundy makes her obsessed with finding out the truth about Miss Grundy's unknown past. Betty’s internet research digs up even more troubling details about Geraldine. There is no record of her life before she moved to Riverdale a year ago. Archie is nevertheless frustrated by Betty’s investigation, insisting she let it go. After Betty and Veronica break into Miss Grundy's car, they find proof of her shady background. When Archie got to know of this, he confronted Geraldine and she explained that she was in a violent, abusive marriage. When she left, she changed her name. He believes her. When she finally stopped her searching, Alice found Betty's diary, leading to her, Betty, and Fred confronting Archie and Grundy. Although the confrontation ended with Grundy being run out of town by Alice, Archie was shown to have no ill towards Betty.
- Betty: "Now that I'm a River Vixen, and you're gonna be on varsity football, I have this fantasy of us as a power couple. Or maybe even just a couple."
- Archie: "Betty."
- Betty: "Is that so impossible to imagine?"
- ―Betty confesses her feelings to Archie.[src]