Muslimahs, are you for or against me in this (see details)?

Basically, my fianc� has this thing with girls I probably explained in one of my previous questions. He's added a few Libyan and Canadian girls on facebook. Now, I clearly know the difference between a Libyan and a Canadian girl on facebook. I'm shocked that I, who was born and lived in Britain all my life, have to put up with his openess to women even though he grew up in a predominantly closed society. In 2008 he started talking to this randomlibyan girl he doesn't know on hi5 (who is the same age as him) and he started to call her 'sweety'. He also gave him both his mobilenumbers (stupidly putting it publicly on the Internet),and in 2009 he commented on her photo (it was mini mouse) and he said 'its like you, sweet, simple and lovely'. And in 2010 , frankly the year he met me, she commented on his facebook calling him lovely' twin brother and saying she hasn't spoken to him on skype for ages... I liked it just to annoy him and he commented straight after that and called her lovely' twin sister and that he'll contact her soon. I told my mum and my mum was just like be careful he's gonna contact her soon and I just laughed and said naah he probably just commenting. When he spoke to me he was like he spoke with her last Sunday, VERY recent and the same day he spoke to me! And she asked him if he is in a relation ship and he said no!! Why did she askkk him? Obviously she's interested! The trouble is, he is always telling me he is busy and he can't talk but I see him playing games, and if he is that busy why does he spend the time talking to that girl rather than me? And when I told him how I realised all this by email that was the point he started missed calling me, texting me and sending me IMs. He said the most important thing he needs between us is the trust but I don't trust people this easily, sometimes it takes years for me to trust someone. I feel he is just playing with my age and honesty as I'm much much younger than him.