God, do I know what you’re going through! Had a break up just like yours, and thought I would definitely die of grief. Wanted to, actually, and it was a rough set of months, but now I can look back on it, shake my head, and say, “Damn, thank God I’m never going through THAT again…” with a rueful laugh. Forgive me if I’m projecting here, but I’m going to try to say to you what I needed to hear when I went through it. Take it for what it’s worth.
Right now, you feel totally alone, like all the meaning and joy in your life has been drained off and now resides in the hands of someone you thought you knew and knew you better than anyone else in the world, who has just been revealed to be a veritable stranger. You are not overreacting-- it is one of the most horrifying, terrible emotional moments a person can go through in the course of normal life. Your pain is real and appropriate, but it’s not rational. You probably can’t hear rational right now, which is normal. I advise you to allow yourself to grieve as you see fit without castigating yourself too much.
I am going to offer you some rational insights anyway, though, in case you can store them for later consideration: maybe you can get back together and fix things so they work right. It can happen, but it’s best not to harbor false hopes of a future reunion. Clinging to such a belief will only slow your healing process. The best advice anyone gave me was to just…let…go. Give yourself permission to grieve, feel horrible, cry on your friends, listen to sad music, write sappy poetry, eat chocolate, the works, whatever you have to do, but banish thoughts of reunion from your mind as much as possible.
Remind yourself that any woman who is willing to betray your trust and the monogamy you shared isn’t the angel you thought she was. Assuming the problems in your relationship were normal, human problems and not the product of extreme bad behavior on your part, her infidelity is a major breach of your trust, not to mention hazardous to your health (sex is dangerous these days, man). Pick your self-esteem up off the ground and remember that you are a good person who deserves to be loved and treated with gentleness and respect. If this isn’t the woman who can do that for you, then she is doing you a great service by leaving you so you can find the woman who can, or simply learn to be happy alone for a while.
I know all this probably sounds like bullshit to you now, which is OK. I hope you can maybe just think about it, say it to yourself a few times even if you can’t believe it, and someday you’ll realize that you can survive without her. You can be happy. You deserve it.
Keep us posted on how you’re doing, OK?