I'm still in love with an ex but he has a girlfriend who I cant stand

I went out with a guy for 3 and a half months and we were totally in love with each other. in march he decided to end it and I was heart broken. during our relationship he mentioned a female friend who was a good mate of his but he said he didnt fancy her.
2 weeks after we've been broken up, he goes out wuth and this really upsets me.even worse, he tells me he still loves me and stuff and I would do anything to get back with him but its just this new girlfriend who is in the way. what can I do? thanks

WELL I dont even know what to say about this situation. I dont know how you could get him back especailly since he has a girlfriend. well are you sure you and him were in love or were you in love and were he playing with you heart. its also wrong for him to tell you that he love you and go with someone else, and to me if you love someone you wouldnt break up with them and THEN GO WITH ANOTHER PERSON. well if you still want him back you could do something EVIL and get you, him, and her together and tell her what he be telling you, she be STUPID to stay with him then, but besides that I think he was just playing around. because what if he tells his girlfriend what he was telling you, 'SHE NOTHING BUT A FRIEND NOW AND THAT HE DONT FANCY HER' you dont know what he may be saying behind you back. best way to find out is to get together... but if it was me I would leave him alone. I dont believe what most boys tell me especially when they have a girlfriend and BROKE UP WITH ME!!!