Where do I start............
He has grave difficulty opening up to people
FOR EXAMPLE!
Say he likes hanging out with Guy # 1
he's just as likely to give Guy # 1 a compliment as he is to start shooting at him.
Since he's a clone, and a half finished one at that, he's just discovering there's more to life then just running around shooting everything that moves, it's also quite troubling to him because it's literally flooding in a very small amount of time.