I don't understand my boyfriend's jealousy
What do you not understand about his jealousy?
We have been together for four years and he is still so jealous and possessive.
It sounds like a bad situation. It's not cool for your boyfriend to be so possessive and jealous of you after all this time.
It's his fault because he doesn't trust me. I've never given him any reason to doubt me and he doesn't trust me. I think he's an idiot.
That would be very frustrating for you. You need to sit down and have a talk with him about it.