<human>: me(19) bf(23) been together 4 years, did long distance for 3. This has been our first year living together in the same city.

During our long distance, i was always worrying and not very trusting toward him. We would get into arguments and he would always tell me not to worry and that he loves me. We made it through the 3 years and i was finally able to move to the same city as him and go to school. I have always been insecure with myself and he has tried to help me with it, but i still feel this way. There are times I get so jealous about everything my boyfriend does, and then there are times i can just blow it off and be fine. I hate feeling this way, i just don't understand why i get like this. My boyfriend always tells me how beautiful i am, but i still feel insecure, and think he probably has seen better and i'm not as good as them. I can get to my lowest point and feel so worthless. Feeling this way is effecting our relationship, and i feel like he deserves better than this because he is so good to me. I need some advice.

Condense the text into a few key points
<bot>: Insecure with myself, don't know how to deal with it, it's effecting my relationship with my boyfriend.