I made my ex homeless

Read previous post on my page for better clarity of situation. Ex (28M) and I (23F) recently broke up out of a four year relationship but have remained friends. He has started seeing someone new and as far as what he’s been telling me she’s ok with us hanging out. A month into his new relationship his new girl gets pregnant. Mazeltov! At this point he realizes that he does not want to be with her and that he want to be with me . I can barely take care of myself so while I’m happy for him it’s a no for me dog at this point in my life. He tells me he already told the girl he has feeling for me and that they aren’t going to be together and they are gonna co- parent the baby. After a couple more reassurances that it’s over. We cross over to being friends with benefits. (I know it was dumb thanks ) No promises to each other but we will see where time takes us because we love one another ( and HE asked for exclusivity untill we figured it out ) . Speed up another month and we are doing what friends with benefits do and I’m dropping him off at his house and his baby mother pulls up and starts yelling. I’m about to go introduce myself but felt it was inappropriate so I say goodbye to him while she’s yelling and drive off . She follows me and tries to drive me off the road. Yelling out the window , flashing lights , just wild shit . Im a medical major so I don’t have time for shit like this ( fighting , yelling in public , anything involving police ) . So here we are speeding down the road like fucking Mario cart and we hit a red light. I’m not running a red light like I said I have a life to look forward to. She pulls beside me crying saying she just wants to talk. So I pull over in a well lighted area and told her to stay in her car and we will talk through the window . Turns out the last 6 months he has been living at her house , having me drop him off at his old address and watching me drive off and then walking over to her house. He also told her that I was gay and left him for a woman , and that he cut off all communication with me . She also told me they were also having sex every night, unprotected . Bullshit I know . Here comes the advice part. Right now he is living under a bridge because she kicked him out ,it’s raining hard and he asked if he can come crash. I don’t want to see him or hear his fucking lying voice but I also don’t want someone I love on the street. What do I do ? Also homeless shelters are extremely full right now. And he is a foster kid and has literally no one . What do I do ?