What did I get myself into?

I broke up with my boyfriend of a year all because my “friends” didn’t like him and cause he started acting different. I love him but I made a mistake, I kissed another guy and we’ve been flirting back and forth but I don’t want to be with this other guy. Now this other guy is confessing his love for me and I just don’t want to be with anyone at this point. I want to be alone. It’s breaking my heart because my ex boyfriend is so heartbroken and it’s all my fault and now if I go back to him I’ll feel so guilty cause I kissed another guy. I’m too deep into this to get out, I want to cry. I’ve already told the other guy that I just got out of a relationship and I don’t want to rush this but he isn’t listening and now I don’t know what to do😪