I think that only you can decide whether or not that you should get back with him or not. You've got to weigh up the pros and cons of being with him. Maybe if you decide to get back with him, you should atleast tell him that things have got to change, he needs to be more open with you..etc I think that suggesting that he sees a counsellor about his past will also be a good idea because it could be that the past has affected him, he may need to talk about it to be able to free himself and move on.