Hi there, to be honest it's not an easy situation to be in. But there is more to situations then just blaming. This situation is one where u have to finally decide and weigh it options.. And work on the options individually.. He is the one u have in love with but he is also the one who had been dishonest, and fighting off lately. From a third persons point of view it seems day he was with u to a point where it suited it and wants an escape now.. On the other hand continuing in this relationship is going to give u some moments which remind of gud memories but most of this time is going to be disappointing and negative. If u choose to seperate at this point u have a possibility of achieving an overall conducive and emotionally stable life.. Though no one can take those memories from u at any cost but so is the case reality also now that those r just memories now while being in this relationship.. U can always get more clarifications and solace in discussing this with a therapist/psychiatrist of ur choice. Hope this helps but feel free to consult further.. Plz take care.