Kinda a long story

Okay So... I started dating this guy in 2009.. And we have been on and off since then... We were each other's first .. But since then I have dated other people... He has stayed single every time we broke up.. And about 2-3 months ago.. I find out that he's in jail... I havnt talked to him in months and was actually in a good relationship with a very nice man.. But idk why I felt like I needed to be there for him.. And I wanted to write him.. So my then bf at the time and I began fighting a lot more.. So we ended up breaking up.. The breakup stems off of me feeling like I still had feelings for my ex.. So we began writing back and forth and I moved out from my ex's... And we begin talking about us getting back together blah zay blah.. His words are sweet.. And I know he really loves me. But I also know that he has changed a lot over the years. And after about a month of us writing he began asking me to send him kinda naughty pictures.. But I don't want to and I feel as though he doesn't respect what I want even though he says he does and understands because he keeps asking.. He says he loves me so much and when he comes home he wants to marry me and put a baby inside me.. Part of me believes him and part of me feels like this is just jail talk .. He doesn't ask me for money or any of that.. And I'm the only person he calls..but I just would rather talk about us and how we are going to fix our relationship.. Blah zay blah.. But almost every time he calls he asks for them pictures and it makes me uncomfortable... What should I do