<human>: Can you give me the gist of the text in a nutshell?

Hey /r/relationships - 

My ex and I split in January after 4 years of on/off dating through college (high school sweethearts, different colleges, growing apart into different people, etc). The breakup was much needed for both of us to grow and mature as people, and I for one am doing great - taking more care of myself physically and mentally, graduated college, got a job, lost 20 or so pounds - and last I heard (No contact since mid-march) she's doing well too. 

I have her blocked on everything (It was a pretty nasty split) but can still see her IG - I saw that she took a guy to her sorority formal, he took her to his, and now I saw a picture that'd indicate they're hanging out over the summer. I'm assuming it's her new BF. That last picture threw me for a loop - Although I'm doing *great* and don't want to be back in the relationship, it still made me go a little crazy mentally that she's, idk, moved on so fast? Not like I haven't seen other people too, but the fact that it appears she found a replacement so fast makes me feel really weird and uncomfortable.

I'm already back on the "consciously not looking at her stuff," thing - I forget sometimes.
<bot>: Split w/ my ex 6 months ago, don't want to be back in the relationship, but I'm weirdly jealous of a potential new bf?