I'm so alone...

I live with my boyfriend, renting the upstairs of my grandmothers house... he's been depressed, really depressed, and then I found out he was cheating a few months ago (emotionally, sent a dick pic over the internet). Ever since I confronted him and told him id try to work on this, he spiraled into an even deeper depression. Feeling unworthy of me and my love. And so he's isolated himself. He hardly speaks to me, drinks every night, doesn't sleep near me in the bed. I'm slowly sinking.... my best friend is slipping away. I can't tell anyone bc then he'll be exiled and he really can't move out from our place bc he's on probation, and if he wanted to leave he'd have to go to court, pay fees- it would be a mess.

I'm so alone.