The best thing you can do is let it go. Yes that's right let it go and if it comes back make sure your strong and have a good plan. Work out what your mistake was did you give too much of yourself.did she feel like you would never leave her. Did she think she had you byb the balls. Were you a challenge.
Thinj about all this and vecome the god dam winner and don't fall into this situation again. Be the prize when she returns get BUSY living life and she will want to be in it. Trust me on this.
Things were never fine and if you thought they were then you were wrong. Doesn't sound like love but more of an infatuation. Love doesn't change that quickly. I once told a girl I would die for her and 5 months later she dumped me. What if I had died for her? What a waste of my life. Lol you get the point. Your not going to die from a broken heart it just makes it stronger.
I know it sucks to be hurt. But you should have known better than to get involved with a married woman. That's a real easy way to get hurt and not a very smart decision to begin with. She may be a great woman but someone else realized that first. I find it hard to give advice to someone that went after a married woman but at least you loved her and were'nt just going after some good sex. You need to just walk away and be glad you don't have a jealous husband to deal with.