Do you think it is okay if I'm unhappy in my relationship and crying my heart out?
What makes you unhappy about your relationship?
He said something to me that really hurt.
If you are so hurt you should leave your relationship if it no longer is loving. You might try to talk to him and let him know how you feel he might apologize to you.
I'm not leaving him broken hearted. He only said something hurtful to me since he's a jerk.
It is okay to leave a relationship if you are unhappy, but if it was only one time then you should speak with him about how he hurt you. If he cares, then he will apologize and try to make things right.