Boyfriends in juvy.

Hey so I'm 19 and my bf is 18. We started our "relationship" while he was in juvy. We've been in love with each other since we were born basically. But haven't told each other until about a year ago. We are pretty serious. Although someone mentioned what if he has this expectation of us and once he gets out his idea changes and what if he breaks my heart. He swears he won't. But won't jail do that to a person?