I have this friend

He and this chick had like a whirlwind romance. They have known each other for a couple years. She was with someone else then got pregnant the baby had something wrong with it and died. Then within a week of her baby dying they’re posting in a relationship, then within a month he proposed. This was August by November 1st she dumped him. She is currently pregnant with his child (maybe). They still live together. He’s texting me every day about how sad he is and he pays alll of her bills. I’m trying to be a good friend tell her she’s nothing. She slept with three guys after they got engaged. She’s already talking to other guys. I’m kind of getting over his drama. He won’t move out of her house because he wants to buy a house which will take him about a year to save, and qualify. He’s working two jobs full time to support her. I’m not sure what to say to him anymore.