My friend always go for the guys I set an eye to

I started to suspect a while ago, the friend I hang out the most always try and flirt with the people I go for , last night I confirmed my theory and yes he went to the guy I randomly picked , how should I take this? I'm confused because I don't know if I should consider him a friend or hang out with different people , I'm not jealous it's just I feel he does it to hurt me