<human>: My ex and I broke up just over two months ago. We were together for about a year and a half. It ended on pretty mutual terms, with little hostility - we both understood it just wasn't the right thing for either of us at the time.

I am naturally a very jealous person, and the idea of him inevitably sleeping with someone else drives me absolutely crazy. I know this bothers most people after a breakup, but if anyone has any advice for dealing with it/getting over it in a healthy way I would be so appreciative. 

I feel like I think about this way too often, and every time I do I feel physically sick and emotionally crushed. We're both in university, odds are it's going to happen sooner rather than later. I'm not even sure why it bothers me so much. I guess I'm jealous as well as being terrified of being replaced - especially if he were to sleep with someone more attractive than me (shallow, I know, but who doesn't have a shallow streak).

Thanks so much in advance for any help you can give me with this!!

Could you distill the essence of the text into 1-3 sentences?
<bot>: Ex and I broke up 2 mos. ago. Just the thought of him inevitably sleeping with someone else sends me into a freakout.