Should I break up with him?

Katelyn • Hi, I'm Katie and I LOVE music. I also like reading, playing guitar, and helping others. :)
Ok, so I've been with my boyfriend for about 4 months now.. and he's still immature. Like seriously immature. He acts like a 5 year old, and he is always teasing me, and there's nothing wrong with that.. it's just that he does it so much that it sometimes makes me cry.. he'll joke about the most sensitive stuff... and he knows that it would hurt me if he said anything about it. But he is sooo caring too.. like when it's just me and him. He is a total gentlemen, and I've asked my mom and dad and whoever else I can ask.. and they say just wait it out and see what happens.. what should I do?