Is it a Crime?

Okay okay... remember how i said i got a new grilfriend, well this is what happened after i posted the previous post.
I went to the gym to work out a bit, you know, to keep in shape. I go into the locker room after i'm done working out, and i planed on taking a shower there. (and to anyone who thinks i'm a wierdo, i dodn't want to do home all sweatty and smelly). I see a guy that i've never seem before, and he was 4-5 lockers away from mine. So we started talking, just harmless and meanningless conversations. I started to get undressed as we talked and i walked to the showers with nothing but my boxers on and a lowel in my hand. I turn on the shower and start wetting myself. I soon hear the same guy come into the showers aswell. We start talking about nonsence and crap (litteraly). We finished showering at about the same time, so me caried our conversation back to out lockers.
I picked up my pants and told him, "Turn around, i need to get dessent." So he dose, and i also turn and put on my spare boxers and pants. When i was about to zip up my zipper, i turn around and i see him staring at me, smileing, and he was naked! (I think he was going to put on his pants when i tuned aroung). I said to him in a flabergasted tone, "Are you gay?" He looked at my toplessness for a moment and said, "Well that depends if you are, are you..?" He said rather shy. I took a momen to respond, "well i was at one point, then i went Bisexual, then i was hetterosexual for a while, so i'm not entirely sure." He finished getting dressed, so did i, then he said in a dissapointed tone, "Well if your not, then thats a shame, but if you where, that would be nice." He winked at me. I finished getting dressed and i left the gym to go home.
The rest of the night, i lied in bed, thinking about what i should do. Mercia is such an amazing person, funny outgouing, makes me laugh, but i don't really feel the same way. And this guy i barely met, and he was peeping at me, but he has such a nice body, and great looks, and is intelectual in his conversations.
I didn't know what to do, i was caught between 2 interesting people. I wanted to tell her the truth, but i couldn't do that to her. I tought about just breaking up with her just so that i'm not in that akward possition all the time.I was also thinking that i should just be with her until she gets borde of me. But i couldn't take it, i had to tell her, so heres how it went, "Hey Mercia, I've been thinking...", "You want to break up don't you..?", "Please?" "Thank God! It was getting really akward. And besides we are more like friends than anything.", "Yeah, so we're cool?" "Yeah."
So yeah. it was a win win situation. I'm free to have anyone i wast (preferably a guy) and Mercia and i are still friends. But why do i feel like i did something wrong?