What LovingRadiance said.
NovemberRain, a member here, has a great method for handling breakups. She does not talk or communicate in any way with the other person for a full 40 days. (This is true if you are the one who initiated the break up or not.)
I tried it with a recent break up of mine and it helped immensely. There is nothing like time to get one's head on straight and start accepting reality.
Especially if there is blaming going on between the two of you, stop communicating with each other now. The less you say to each other the less you will have to regret later on. Doing this may make LR's scenario of a lifelong connection, even if not what you wanted, possible.
I dislike the idea of letting go of attachments. That part of Buddhist thought bugs me, as well as what I perceive to be disdain for the world. A major reason I am pagan is that many pagan paths love and appreciate the world rather than seek to escape or transcend it. Anyhoo, off topic and your mileage will vary obviously!
One thing that works better for me, at least right now, is to frame relationships (past and present) as what I learned, or can learn. You learned that your marriage can survive something truly threatening and that your husband is willing to work things out with you. That is awesome! Acknowledge the joy in that, even as you grieve the end of your relationship with your girlfriend. Your relationship with her allowed both you and your husband to grow in some unexpected, painful, but powerful ways.
And you learned that when people tell you who they are, what they really want, what they fear - believe them. Believe them especially if their actions match their words. (It is our actions that truly show who we are but words are important clues not to be devalued.) I don't mean to finger waggle 'You should have known!' - that is not my intent. Sometimes one has to zip right past the huge red flag in order to really get why that flag is a-waving. Goddess knows, I've done it enough.
I wish you the best.
Last edited by opalescent; 02-23-2013 at 07:36 PM.