Well first of all I'm Scottish and my fiancée is in Perth prison and he is looking at 2-3 years for attempting to use, and assault. He has anger problems which started when he was 12 when he lost his best friend and he blames himself for it.

And he wants the help but the past few days I keep asking myself does he still love me? Is this normal to think this because he's locked up or what. I'm scared of losing this guy cause he's told me he wants to be with me when he's out of prison?

10's of thousand of women ( and men) wait faithfully at home, going to visit and writing all the time to their love one while in prison.

Has he harmed you ? If he anger is bad why did you stay with him before ?
What is the plan for him to get help and change when he gets out.

Prison promises are worthless, no one in prison is guilty, and everyone will change and they will promise you everything while they are in. What they were to you before they went in, is where you are at.

Who did he assault?
I would advice you to stay well clear of this guy;he's in prison for a reason.

Let it go and take care of yourself.

I think it best to carry on with your life, and see who he is when he comes out of prison. That long in jail can change him, for better or worse, and he will probably say anything to keep touch with the outside world, or people who can help him get through this.

You need to recognize this, and be a friend if you want, but make no commitments to anything that far in the future. Doesn't matter what he says as they are but hopeful words, until he gets out, and puts positive actions behind them.

Only then will you know for sure what he is about, or if he can be believed. Maybe he learns a lesson, maybe he doesn't. Maybe he gets the right help, maybe he doesn't. Live your life and see what happens.