Are you the same person who is engaged to the man who she doesn't even like anymore? If so then you should definitely leave him. You might be having feelings for you ex because your are not happy in your current relationship and you are thinking he was better than the man you currently have. Just remember the man is your ex for a reason. Too many times after people break up they forget all the bad things and miss people. I would try and find a new man and forget about the ex. Vary rarely does going back to an old relationship ever work out. Usually you will end up splitting up for the same reasons you did the first time.
It isnt good to be with someone and not even love them.. Its bad whenever you love someone else whenever your withsomeone you wouldnt like another guy if you really liked the one your with now.. so you might as well leave the ldr now.. they usually dont work out anyways and you dont ever get to see each other,or talk in person and you never know if they could be doing something behind your back.. just saying? i would never get in one..