<human>: Can you provide a brief rundown of the text in within 3 sentences?

This is just going to show how very insecure I am, but my boyfriend is starting grad school next week and I'm afraid for our relationship. Aside from the demands that grad school will have on him, resulting in less time spent on "us," I'm always nervous of my significant other meeting the true woman of his dreams in class or something. So, so very insecure. I know. What is wrong with me? He has a couple of girl friends in general, so it wouldn't surprise me if he makes a couple in his new classes. I need to find a way to not let jealousy get the best of me.

We have a great relationship. We rarely fight or disagree. If there's a disagreement, we talk about it in a very rational way. I've always been so impressed by the way he handles it when I come to him with an issue. But this isn't one I feel I should tell him about. It really shows my insecurities. I think I know what makes me feel this way, or at least something that has contributed to it. My high school boyfriend was two years older than me and therefore started college when I was just a junior in high school. He met all kinds of new ladies in his college classes and would kind of rub his new friendships in my face, telling me about how great these new gals were. My already naturally insecure self became even more insecure. I admit, I ended up trying to prevent him from seeing these people, which came off as very controlling (because it was). We eventually broke up a couple months later.

I need to be a mature, confident adult about this!
<bot>: My BF is starting a graduate program and my insecurity makes me nervous that he will meet the woman of his dreams in his classes. I know I'm insane. Please help.