Search Results: drinking at a club

Ok people, so I'm in studying abroad this semester in Spain. I've only been here a month, so my Spanish is still not up to par. I was out clubbing with some of my friends from my school (and we had been drinking) when a guy came up to me and started talking to me. He was asking me questions, but it was loud and I don't speak much Spanish, so there was a big language barrier. The last thing he asked was if he could have a kiss? But my brain is slow with Spanish, so I didn't register what he asked me until he was kissing me. I pushed him back immediately and told him no. He advanced toward me again and I told him I had a boy friend, pushed him back again and then walked away.
The reason I need help is I don't know if I should tell my boyfriend or not. He's trusting me to be faithful to him and tell him the truth. And I feel like would probably want to know if some girl had come into him. But I'm scared to tell him even though I did nothing wrong. The last serious girlfriend he had, (of 2 years) cheated on him while she was studying abroad, so it's a touchy subject. A part of me feels like I should tell him, but the other half feels like this will cause strife. Even though I didn't encourage the kiss or kiss the guy back, it still looks bad. And my bf knows I was drinking last night. I'm afraid He'll be mad or suspicious or sad. I don't want to cause tension in our relationship for no reason. So what do y'all think? Opionions? I really want to do the right thing here