<human>: Hello all, let me start by saying this us my first time on reddit! You all seem like a very intelligent and positive crowd. Please feel free to leave comments about anything.

I am a 22F and my boyfriend is a 22M. We have been together for almost 2 years and I am having issues with jealousy. I have had some very bad relationships and happenings in the past, along with some severe issues from childhood that have pretty much decimated my self confidence when it comes to men and dating. I am extremely resourceful and independent while I am single and I am finding it difficult to bring that into my life with my partner. 
He is very kind and extremely intelligent. What I believe now and what we have discussed is he would sooner break up with me than cheat. 
When I get onto social media or outside in day to day life, I see extremely hot women who I believe are better than I am and I immediately assume if given the chance, he would sooner leave me for them. He tells me over and over that he wouldn't but I really just can't believe him and it is hurting our relationship. I have no idea how to cope other than talk it out with him whenever I feel jealous, which is way too often. What do you all do in your lives? Any advice?

Can you give me the gist of the text in a nutshell?
<bot>: I am a jealous girlfriend and get extremely sad when I see very beautiful women because I cannot hold a candle to them and I do not know how to improve this and stop stressing out my boyfriend.