SUPER HORNY but having problems with my boyfriend

My boyfriend and I have been having really bad problems in our relationship. We have talked about slitting up for the good of both of us. He has a lot of mental health problems and I have my own issues. We are living together and financially crippled. I haven't been interested in having sex with him at all due to constant fighting or crying on both ends but today I am in so much need of sex right now I don't know if it's a good idea. I feel like he will assume everything is okay when it's not.