<human>: Last night I was at a party with a few friends and long story short I got drunk and made out with a guy I had had a crush on since my freshman year of high school. Because I believe in total honestly in a relationship I told my boyfriend.  Today I got a text message, a reply to the text message I sent him last night, that said "I think I'm done" and "Just leave me alone."  We have been dating for 4 almost five years now and this isn't the first time that I've done something like this so rightfully so he seemed to take this instant the hardest and now I'm scared. I felt guilty the moment I was sober enough to realize what had happened and I'm afraid that I might have really fucked up this time. Right now I'm giving him some space but I'd really like some advice on anything I can do to make him understand that I would never do this again, and maybe ease the pain for him. Anything positive would be greatly appreciated

Can you summarize the given text in a few sentences?
<bot>: I got drunk made out with a guy who wasn't my bf, need help knowing how to help my bf with this.