You've given your boyfriend every reason to trust you, so this isn't about how you act. Rather, it's his responsibility to trust you, and to stop constantly asking where you're going and who you're with. Maybe he's the suspicious type because his last girlfriend cheated on him, or his parents aren't trustworthy or reliable. But whatever the reason, it is no excuse for how he's acting.

You say that otherwise he is a good guy, so why don't you act as if he were a trusting person and see how he responds? When he acts suspicious or asks you all about where you were, nicely but firmly let him know that you don't want to report to him as if he were your parent or a probation officer. Tell him that you understand he has a difficult time trusting you, but that you want to be in a relationship where both people have faith and believe in the other, and that neither of you should be keeping tabs on each other. See how he responds. Hopefully, he will understand this and see how his jealousy is making you feel. His behavior might not disappear right away, so give him gentle reminders when he starts to slip and use humor to break the tension.

However, if you show him that you are an individual entitled to some privacy and trust, and he reacts by becoming even more suspicious, then that's not okay. Suspicion can escalate to even more controlling behavior. If he starts to demand an account of each minute you're not with him, or forbids you to be with friends or do activities on your own, then the relationship has become abusive and you need to get out, even if you care for him. If you are afraid to end the relationship because of what his reaction might be, tell a trusted adult, such as a parent, aunt, guidance counselor, or your minister. People who are supposed to care for you should not make you scared.

— Kate Forest, MSW