Is something wrong with me?

Earlier tonight a guy came over. This guy had been asking me to have sex with him for weeks now and tonight I agreed. He comes over and we get hit and heavy and it gets time to do the deed and he stops and says,"I can't do this I'm sorry I'm sorry I'm sorry". I asked why and he just says that he doesn't have sex with random girls. I asked him if it was because of my weight and he said no but I dint understand why he would just stop like that, he just kept saying sorry over and over again and then he left. What am I supposed to think about that?