Should I tell him?

I just got into a long distance relationship couple weeks ago when I met my so at a vacation and spent some nice times together. We already plan on visiting each other as soon as possible. What I am concerned about is that last night I went to a party back home and had some wine, but was doing nothing just having fun. Later that night a good friend of mine who we used to occasionally hook up with before came to me and he was obviously drunk. I didn't expect it to go a wrong way because I knew he had a girlfriend. He just put his hand around me and held me for a few minutes. Then he suddenly gave me a few light kisses on the lips from which I pulled away and definitely didn't make out with him. When he insisted to do more I turned him down saying that I can't do that, because I have a boyfriend. What he said surprised me, because he said he wouldn't know and that his girlfriends is actually fine with it. Nothing more happened after that and he just held me for the rest of the night. The thing is I don't know if to tell my new boyfriend about it, as I felt completely nothing for this guy, and I don't want to disappoint him, specially when I know how hard he works on visiting me later this year. I also don't want to tell him things like this over phone or text, which could be the only way how to do so. What do you think I should do?