how long has it been since he broke up with his ex.............if not too long then honey...thats bad news
If he still likes his ex, stop being his crutch and move on.
he still wants is so-called ex that means if he took you you would have to constantly wonder if he is really faithful or wants to have his way regardless of others
Is it necessary to move with him..?
He is still getting over her now if you really like him get a group of friends to go to the movies tell him if he is not doing anything he should come meet you guys there don't invite his ex. If she shows there is a chance. Then the next week ask him if he would like to go hang out angina this week if so pick a place and get to know him better.