Am I a sh*tty person for this?

So there's this guy I've seen at school. He's really close friends with my German friend, let's call him Varten. So him and Varten have known each other for a while and I'm pretty sure they're both on the wrestling team. So yesterday I gave him a letter explaining how I liked his shirt and hoping we could be friends. He then told my friend to tell me, if I wanna be his friend just go straight up to him. So the next day I did. I introduced myself and he introduced himself. Here's the catch tho, I have a crush on him but he has a girlfriend. Am I weird for becoming his friend even though he has a girlfriend? I support him and his girlfriend relationship but if they did break up would it be weird if me and him got together in the future? I mean me and him have a lot in common music-wise and he's a cool guy, but me liking him and me being his friend makes me feel like a shitty person because one I'm a girl who is his friend and two how would his girlfriend feel about him having a friend whos a girl. I'm NOT trying to ruin anyone's relationship dude. Also, I did try my best to not make it weird when I introduced myself out of the blue. I even explained to him that I was the one who wrote the letter and he was cool with it so...

Am I a sh*tty person for this?
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