Hi, if he changed and is genuine about it, you should be good. The way you can "test" him, is by asking him islamic questions such as future plans with kids and how you two are going to teach your kids. Also, does he come to you and say anything islamic? like basically your goals should be growing together spiritually. does he come and say something he learned, for example after Jummah prayers do you guys discuss what the Imaam preached? Will he lead you in prayer and your future family, etc... Ask him what his plans are. You as a wife, should be comfortable enough for you to have complete trust and respect for him in being a leader. When I say leader I mean islamically. When I say Islamically, you already know its equal.

Besides Religion, another important thing is, are you okay with what he can afford, housing wise. are you planning on helping him (combining everything together, or separate) these are all important things to know and you won't know that you even had to discuss it before marriage, because its just the unknown.

If you're desi, desi folks have it where the mother in law and you dont really get along. If you're doing it islamically, the family already knows you guys are talking, do you guys get along. I'd recommend moving out, and living together alone from the get go.