Something that bothers me a lot about my gf and I please help me out?

Alright, check this out. I've been going out with a girl for about almost two months now. She lives in England only to finish her last year of college. Shes coming back next year to me here in the US. But i cant help but feel like something is wrong. For example. She went on "holiday" which is like a small vacation in UK, for two weeks, but we had a fight before she left for it. She didn't say bye or I love you to me when she left because she was mad. Now i think shes going to cheat on me or do something bad that will make me angry. Just so you know i am the jealous type and i cant help it. I get jealous even if she talks or look at some other guy. I know im insecure. But how can i just stop this feeling. I trust her, but i don't know why i get this feeling that shes doing something bad for our relationship. By the way, we're both the same age, 17, I know when i see her next year our relationship will re ignite itself and it will all be okay. I just don't know whats going on. Its been a while since we talked. How can i know or at least make myself feel better about our relationship, Like, how do i get rid of this feeling? How can i make our relationship last until next year until we actually see each other again. We love each other very much and we said we would never cheat on each other because we both have been cheated on before and it sucks. But im still worried about it. Thanks for taking the time to read this. And please....serious answers only ><