@graciela,
It´s seems to me that everyone seems more interested in the couch surfing subject, while theres a situation here.
Personally i think a solid relationship requires trust intimacy and commitment. And it seems to me that you have the 3 of them completely shattered.
I don´t know if you have children, but i guess you don´t since it´s something important and you ommited. You seem to have lost complete connection with your husband. In his situation i will like to know. And then decide while i should do with you.
You don´t love him anymore, you broke his trust to the point of having sex with an stranger an then you started having feelings for that stranger. That is a real teenager behavior, don´t you know that during intercourse our brains produce substances that not only mediate the pleasure feeling but also helps create a bond with the person you are f*cking. That´s a basic evolutionary solution to guarantee that the offspring that comes after that intercourse will have two parents and not only one to take care of him when it is born.
This was going to happen. And maybe thats why you have now no connection with your husband. So you broke intimacy and commitment also.
Get your self together, try to found something that is called empathy inside yourself, act like an adult, put yourself on your husband´s shoes and think for a moment: how will i feel if the situation was exactly the other way? (i mean he is cheating and having feelings for her new lover).