I hate how much time he spends with his child.

This will come across horrible but
I've been with my boyfriend for 5 months, he's 22. 
He has a son that's 2 and a half, this is his only child.
He is an amazing father, will do anything to keep him safe, protected and loved. 
My boyfriend and his ex have 50/50 custody, so one week his ex has him and the next week my boyfriend has him, on holidays they bring both their families together so they can both have him and that way they don't have to split it.
I HATE how much time he spends with his son.
He will seriously go see him everyday that he doesn't have him, even if it's just for an hour, or even 30 minutes.
He talks highly of his ex when people ask about her and he will stand up for her when people talk badly of her and he always says it's because "she gave him the best gift in the world, their son and because she's an amazing mother to him" 
Am I in the wrong!?