well,i think it's time you remove yourself from all the madness.She is playing serious games with your heart.But that game requires 2 players and at any point in time you can choose to get off this crazy making merry go round.If she truly loved you she'd be moving heaven and earth to do whatever it takes to make you two's relationship work.Even if it meant taking a break from you and getting counseling for herself.but the fact that she continues to be involved with this man,shows no regard for your feelings whatsoever.You cannot fix her,nor can you change her.This has got to be tearing you up emotionally and the best thing i feel you can do for yourself is to love and respect yourself to walk away once and for all and don't look back.No need to be nasty.Just very firmly and politely tell her enough is enough.you love yourself too much to continue on this way.Then ignore her completely.no matter how lonely she says she is,nor how many texts,emails or whatever else she sends you.I know it seems far easier said than done but just ask yourself,which pain will be harder,dealing with this constant yo-yoing of your emotions or choosing to deal with the necessary pain that healing requires but then being free,healed and whole.I sincerely wish you the best.