Hit On Conclusion

I went to see Mark to clear the water after school. It was really awkward at first because neither of us knew how to initiate the conversation about the guy I'd been out with. God I hate saying it like that but I don't know any other way :|
So I sat in the round chair in his room, he sat on his bed and released any remaining frustrations on his XBox by beating up other online players at Street Fighter. After getting lonely where I was I went and sat by him and we made casual conversation, dancing around my afternoon activities and his feelings on the matter, until he came out and asked about it.
He was basically like "why did you even go out with a guy who you knew liked you in the first place?"
I told him how we used to know each other and he kinda had a thing for me, but since we hadn't spoken or anything for the past year, I figured he would have grown out of that crush and meant nothing more by hanging out than innocent, straight up hanging out. I told Mark that I hadn't meant to upset him, and that I had no idea he would behave that way.
Mark then told me that It was okay, and that If i was any older (his age) he would have taken it as a serious offence on our relationship, even considered it cheating, going out with a guy who liked me. He then made a comment about how naive I had acted, but upon thinking of how he would have taken it when he was 18, putting himself in the situation I was in, he realized that he would have thought nothing of it as well.

Lesson of the day, you can't trust guys. :P