Boyfriend with depression

So my boyfriend and I have been going through a hard time and things got better but yesterday we had another big fight about his jealousy and he knows he overreacted but it’s been hard. He lost his oldest sister his freshman or sophomore year of high and has always struggled with it when we first met and I was helping him with he episodes of depression he said I remind him of his sister he hasn’t had suicidal thoughts till we started our rough patch that started in January but got a lot better since then but it got really shaken up again yesterday. He said he would do anything and understands I need actions to know he’s trying and that he loves me. I told he should talk to a close friend about everything he was very upset and said he wouldn’t do that I honestly don’t know how to help or what to do because I can’t just get over what he said and how he reacted but I also of course don’t want him to do anything to himself and idk how to persuade in our relationship. Please help I would really appreciate it! I’m