Love bombing is so painful

How am I supposed to leave the one person with whom I share everything with. I know the pain I am going through isn't healthy, but I seem to be stuck by invisible thread. I know it's not my child keeping me because I have a good job to support us. I'm tired of it being made to seem like I'm the one causing problems when all I do is be the best mom and significant other and daughter to his mom. I cover any extra expenses while he takes care of his car note and insurance. I'm not looking for gratification because I do it out of love. But it's becoming hard when he accuses me of cheating because I'm not tight enough if we do decide to do the nasty that night. Mind you have not done any exercise for my pelvic floor. So I get sad and depressed because now I feel like I'm not good enough. He threatened to leave us. Yet I still want him to stay. Is there something wrong with me? Why do I stay when it's clear he doesn't want me. He only wants me when it's convenient to him.