You need to find out why isn't he replying or ever willing to contact you first. There has to be a reason. Ending without knowing the reason isn't smart thing to do. Of course i'd be mad too if someone did that to me. But you are going to marry this guy so find out the reason he doesn't contact you.
How should I find it out when he is not replying.
And I am sure when he will reply he will say there is not anything and you get angry for no reason blah blah.I know this because this has happened earlier.