He just went out one night and stayed gone for three days. He says its because of me and nagging him about if he's cheating on me. Suddenly he doesn't want to be around me. Watches porn every time he's here, but states he has erectile dysfunction. We hardly have any sex and I've gained a lot of weight. I let him stay to help him at a tough time. If I want him to go then I am conditional, but him staying, what little he is here, hurts and I can't focus on anything else. What do I do?

Let him go and get your happy life back. He ain't doing you no favors.

OMG - Please, kick him out!

Majority rules, kick him out.
He is a loser. He is letting you put a roof over his head. He has erectile dysfunction because its functioning in other places if you get my drift.