So sorry to hear this Yeru,
The SAME thing JUST happened to my brother in law. My sis told him she met a guy at work and fell in love. After 24 years of we all thought was a perfect marriage she moved out of her home and in with this new dude!
They have two boys 12 &16. She just walked away and they were getting along so well. ....it blows me away. I don't know how close you two were but I know it must be hard. Perhaps if she is bi-polar, as heaven said, she will come to her senses. I have a neighbor with that awful problem and he really wacks out.
We are here for you....you know that. I for one will pray for you.
Please stay in touch with us....your friend, Gumby