Drama drama

We have a 5 mo together his a great dad but can be a really shitty persson sometimes.. Some examples

Starting fights for no reason then leaving for a week or more threats to divorce and threats about infidelity when his in a rage. He wants another child now but his clearly not ready even though being a amazing father WHEN HIS HERE like, he could up and leave and I'm stuck with two young bubbas. I keep hoping things will get better for us but his so immature at the best of times. I was thinking going on the depo shot and telling him (when he decides to come home) that I won't give him another child until he can prove to me he will be a man and be there for us. 

I'm used to being alone with my daughter now but couldn't imagine two baby's !