Me and My girlfriend are going through some hard times?

If you guys got over the fact that she started having feelings for another guy then that should be over with, if you forgave her then you guys shouldn't keep bringing that subject up again because that's only causing trouble between you, so talk to her about this, about how this can't go on because it's getting to the fact where you can't tolerate each other, but you should check yourself out because if she has been with you for so long and you guys have gone through a lot then why is she having feelings for some other guy? this shouldn't be happening, are you sure that you and her are on the same page as far as your feelings for each other??? talk about it with her it's my best advice. Best of luck to you.