How can I make him understand?

now you know why older men pick younger women...they have low self esteem and having a younger person makes them look bigger....he cant handle and adult relationship....you can tie your self up and duck tape your eyes and mouth shut....will not help this guy....not matter what you say his mind thinks different about it....best thing for you to is get out of this relationship before it becomes abusive...and dont have kids what ever you do...this is exactly how abuse starts, they gain control over you by you not being able to say any thing to any one....then the hitting starts...you need to get out..Good Luck