Why has my boyfriend changed so much lately?

Ok so weve been together from november last year, and everything was great I had the sweetest nicest boyfriend ever that would do anything for me I could always rely on n told me constantly how much he loved me. we got our own place n we are ment to be goin to spain for a week on the 25th. But this last few weeks hes just changed! First hes been sayin im selfish n he does everything for me n I dont help with his problems.. His problem is dangerous driving offenses hes already lost his liscence a few weeks ago for one and the 2nd he hasnt got a court date yet but hes been told it could be 6months in jail as 3people were injured in this crash. I cant help with this problem! Ive been going to court with him and ive said il visit as much as possible if he does end up in jail! Hes been causing arguements with me alot lately and in one of them he told me he didnt love me anymore then smashed up my bedroom n left me.. A couple of hours later I started bleeding and it turned out to be a miscarriage. I feel I lost our baby due to stress being caused my him, im heartbroke and I dont know what to do I just want him to go back to the sweet man I used to know instead of this monster. I dont want to leave him because what he was before this is worth putting up with all this crap. He started another arguement yesterday n im stil gettin nasty texts :-( I dont know what to do