he had me at i love you

I am writing this because right now i feel like shit. The guy i am with for almost a year, whom i only gave nothing but real and pure love is apparently cheating. I also got proof and this girl confirmed that she is indeed with him too and she doesn't know abt me as well.... For real...the pain is too much. I did so much for this guy. And so did this girl. Now, he has no idea that i am in contact with this other lady and we are basically girlfriends now lol but i will still be honest with u guys, it still hurts like crazy. And he is still trying to fuck us up and keep me. And maybe her too.. He doesn't seem shy or apologetic that i told him that i know he has this other woman... Can u guys impart advice.. I really am devastated and cant see clearly sorry to say...