Dingo has a good point. Also, it sounds like you're trying to take responsibility for his possibly sleeping around. You could give him loving that shocks porn stars ten times a day…if he wants to sleep around, he could justify it by "feeling tied down by one person". Whatever happens, it's not your fault. Do what feels right to you.
Resentment occurs when we aren't doing what we need to care for ourselves, though we expect others to do it for us.
