Search Results: scaring a boy away

i heard boys don't ask out pretty girls unless they FOR SURE know she likes him or knows she will say yes because they think there's too much competition for her, some think pretty girls are more likely to cheat and that they'll have to watch their back all the time because other guys will try to get with her too so even if she agrees to date him he has to be on guard since other guys probably want to steal her away?
Or is it just bs?

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