<human>: Can you succinctly summarize the text in 1-3 sentences?

Long story short, I flirted with my local barista all summer, and he gave me his number a few weeks back.

I invited him over for a good make out session about two weeks ago, things got pretty intense, but we stopped because he knew I didn't want to have sex, and he didn't want to be "THAT guy."

I don't have feelings for this guy; I just wanted to make out with him. Absolutely no emotional attachment.

Anyways, just found out that he's had a girlfriend this entire time (I actually know her), and I'm not sure what to do about it. Do I tell her? If so, how??

I had a gut feeling that I wasn't the only girl he was talking to, but I didn't expect the other girl to be his girlfriend... Whoops.
<bot>: I intensely made out with this guy one time, no strings attached, and just found out he has a girlfriend, what do I do