Sleep on your mom’s couch! 🙂
It’s not a good way to model relationships for your daughter to be with someone who’s not interested in you enough to live with you and your daughter, but cheat on you, too. The tension will eventually bubble to the surface and children pick up negativity.
Being at your mom’s house, even though cramped, will be a loving family situation, and sometimes everyone needs help. You’re lucky to have your mom available! 🙂