It's just a fwb, not a relationship. Sounds like you are expecting too much.

The cheating is bad enough, but ignoring you after what he did is crappy. This is not a good guy. I don't see any remorse. He has you chasing him. That's insane. Block him and go no contact.

You are enabling her. Split the finances, and make it clear how much she is expected to contribute monthly. Do not pay her share. Let her know she has to keep a job and pay her portion and that you will separate. No excuses. She has therapy if she needs it. She does this because you allow it.

I wouldn't deal with a guy like that. He should have been upfront with that information. If he's sleeping with someone and building a relationship with you, you deserve to know that. I avoid guys with no integrity.

He's lying. He installed it. If it was an accident, he would have uninstalled it as soon as he saw it on his phone. He is cheating or trying to.