HELP MY DAUGHTERS DAD IS GOING CRAZY!

so my daughter dad and I been broken up for almost 6 years and recently his sister died, he's getting a divorce, and my daughter told him on the phone that her daddy (which is my boyfriend she's been knowing for 5 years) gave her a room maker. So I know that made him feel like he's losing his daughter as well. Anywho is currently in the navy and after telling me all his depressing stuff he asked if he could ask to marry me so that my daughter and I could come to the state he in. He said he don't mind if I have a boyfriend he just wants to be with his daughter and don't feel comfortable visiting home because his sister died and bad memories. I told him no I'm sorry things not going as planned and gave him my Mom number so he can talked to her about his problems and not me because I don't care. Before y'all go off calling me inconsiderate please note that I'm not going to explain the shit I've put up with from him and frankly I'm numb and this is karma (not his sisters death). I'm angry that he choose to go to the military. Since his sister has been sick since he has signed up he hasn't seen his child much and I'm at the point where I want him to disappear he doesn't call because he's mostly on the ship and what not and my daughter always ask when can he come over or when can they be together and it's always the same thing and she cries. Their current communication is skype. It makes me cry and so angry. No one told him to sign up. He went to college and graduated and had a great job and saw his child a lot now it's non existent and I want him out of our lives for good I can't handle their phone conversations and her tears my daughter is 5 😔 what would y'all do or how would y'all handle this situation of absent mentally unstable baby daddies