My husband doesn't love our baby

I noticed he didn't want to hold her or feed her. He would look at her( but not in a loving way )
He doesn't come home some nights, and when he does he's in the room on his phone or playing call of duty. We haven't had sex in months. I feel like a single mother. He doesn't help me at all. He ignores her and me. 
Now he tells me he has a good friend. Her name is Gabby and they spend a lot of time together. He told me they went out to eat and the movies, but just as friends. He says he hasn't had sex with her. 
I'm so angry with him. He's giving her my time. I didn't receive anything for Mother's Day and I'm pretty sure he bought her a bracelet. He tells me he loves me and I feel so stupid for believing him. He's dating someone else and coming home to shower and change clothes. I love my kids but I just want to leave.