I haven't had a squish in quite some time, and I've probably only had a handful though they'd last for a good portion of a year. One of the more noteworthy ones was last year.
He had this rock hard shell that no one could seem to crack. No one got past a surface friendship with him, and he often treated me (and others) like shit since I was a bit of a pushover. He was still fun to be around (as a last resort, mind you) but I'd easily tire of the teasing. This was the status quo for about four years until year 12 retreat, just before the year started. He and one of my outer friends (who is now a really good friend) were the only ones in my retreat group who didn't despise my existence and I thought oh boy, just survive the week. I hung out with him out of necessity and we bonded a lot (over our mutual hatred of the retreat program, we were quite bitter together). The moment I remember the most was the final day when we were finally allowed to go to the beach. It was the middle of summer in Australia, and we had just spent a week at a campsite with a couple fans at best. We were all dying to go and I remember us both sprinting into the freezing cold water and just playing for ages. We were splashing and laughing and it was the happiest I had ever seen him, it was like I had managed to barely crack his shell.
This lead to a wonderful friendship in our final school year. We were practically joint at the hip, and while we usually had the bitter aesthetic going on I suspect he was happy deep down to have a proper friend (the people at that school were so fake, and no one else tried to break down his walls like I did). I suspect we could've had a really good QPR, and he was my first squish that I had known was a squish (and not a crush).
He ended up leaving for another state at the end of the year and it still kills me that I didn't tell him how I felt, or how much I appreciated having him there in such a difficult year. I wish I could fly over and give him a big hug and tell him how much I (platonically) love him also because he told me recently he still hasn't made friends at uni. It's hard because I normally grow out of my feelings in my own time but I felt like our time had been cut short and I haven't completely gotten over it.