His initial reluctance to open up to you will disappear and he will now want you to know everything.This will include his hopes and dreams along with his deepest fears. He can express himself much more openly as part of a couple and you may not like it but you will have to get used to it.
He believes he has won here and got what he wants and is determined to keep it.
Now you may be treated the way you should have been in the first place with flowers and chocolates and lots of kind words.
He will seem like a little puppy desperate for attention and love but not prepared to do anything in return.
If he can be taught that love is there but he has a part to play the relationship should last.
At times it may be worrying how dependent he has become on you.