Is that not me to decide?

I was totally annoyed by a friend today... There was a good friend since we were university ,we were crazy friends. We went out for musicals jazz shows theater shows.. lot of fun what hear by any students from university..we always like a bracket.Where I was he was there. So every one called us Kappa Bracket. Time passed we were graduated I moved to EU. But friendship was already there even though we could not go out as students.
Some time later like 5 to 6 years back he moved to Holland with another girl. Then another ,then another and then another and another and now lost the last one too. Who ever he was with were my friends either colleagues too.Few of my university friends fallen love with European guys and moved here in EU. Some times we gather all together to some ones house or we all share the price and book a hotel and spend time together as families.
And I met this guy during one of those outings. And then he start call me over the phone coming by me for books. Or some sort of notes or ask me to read his thesis and give him a support or something I can say.Some times he came with his guitar and play music.
This guy become bit too much but I kept quiet with respect for the long friendship.This morning called me over the phone. And I asked me out. And I simply told him I am seeing some one so I am not able to date him. Then he asked me how I met him. I told him the truth. He said on the spot how come you trust a guy from internet than a good friend of yours for ages? I felt bit not a bit honestly I was pissed I mean is that not me to decide?

I feel annoyed. Why men got to say such things I mean how you do this ,, you did that,, ? Honestly I am not a bit totally irritated as I feel.