my best friends abuser

im not going to use names for privacy reasons but i could really use advice on what to do.

so ig ill start at the beginning. my best friend (f26) in the whole wide world has an abusive boyfriend (m24) who is not letting her talk to me because he knows i see through him. sometime in november she was at my house and she wanted to spend the night. we made up a plan that i would ask her bf bc he was more likely to say yes to me. he didnt even respond to me and just sent her a message that said no. i told her she is a grown women and if she wants to spend the night then she should so she texted him and said she was going to. alot of stuff was said by him (she moved states to live with him and one of the things he ALWAYS says if theyre arguing is “im buying you a ticket back and youre leaving”). flash forward a bit of arguing with him and him saying theyre broken up and that she needs to go get her stuff or he would send it all back to her hometown (all because she wanted to spend the night at my house), we decided to go get her stuff. we get there and she promises she will come back to me and that she will be right back. even leaves her vape as a promise. we were outside her house for 2 hours and long story short, he got her to stay with him. they come back out to grab her vape and he barely will let her talk to me. i get out of the car and get in his face and yell that i know what hes doing and hes just straight up lying to my bf (who drove us to her house) saying things like i cheated on my bf or that i hate that i had a kid with him (none of that is true) and eventually my bf had to pull me back into the car. since then, i have been blocked by her on everything (obviously he blocked me, not her). i recently remembered i had a different snapchat that she had no idea about and i added her on it a couple days ago. she added me back IMMEDIATELY. this morning i woke up to a message from her that just said “do not” and i was blocked. that was also him.

im sorry if that was all over the place but i just want to know if theres anything i can do to talk to her or just how to cope because for months now i have been severely depressed over this and i dont know how to help myself or her. if you have any advice, please let me know. i hope you all are okay and have an amazing day.