I try to steal my friends' girls?

[Ineed]

The title doesn't really say it all. I'm not like this with ALL my friends, but sometimes if I see a friend talking to a girl online (twitter, facebook etc), I ultimately get jealous and have the urge to "steal" her from them) obviously id NEVER do anything if they were actually with them, but if they are just talking and the girl also gets on with my now and again, i'll make the effort to win her over. The first time i did this was 2 years ago and it was over skype. She eventually just really liked me and I just stopped liking her once I won her over. The second was an older girl and it was over facebook. I saw my friend flirt with her and I just subconsciously thought (I need to win her over) I ended up doing that but then I also stopped liking her! is there something wrong with me or a reason behind this?
they're not exactly friends anymore, I just knew them and used to talk to them. If they were a proper friend id feel very guilty. its still a douchy thing to do, but i really liked them...but then the feeling just went. thats why im so confused

[kaylee]

You should stop being a bad friend....find your own girls.

[H]

Ur a jealous freak who cant find his own friends and doesnt like seeing his friends happy.

[Izzy]

learn to find a girl that YOU, not your friends actually like,
stay with her and don't give a brick about who they are flirting with and don't take them from them because to be honest you an see it yourself it just makes you a douche bag
And no one likes a douche

[imad]

Your a prick and one hell of a quere.

[Felicity]

try and find someone you like that you fall in love with, then you'll stay by them. It happend to me, i like to ''catch'' a guy but then i have no more interest.. Until i found someone who i actually fell in love with.. Although it didnt work out with him I havent done it again C:x