I’ve known my FP for about a year. We’ve only been strictly platonic friends. We talked a lot though. I blocked them a few times when they were neglecting to give me attention (for example, we were supposed to play animal crossing the weekend it came out but instead they ditched me to play league with their other friends). That hurt like a bitch so I ended up blocking them. Later I sent them an apology message and we reconnected, but didn’t talk nearly as much as before. I think they were trying to keep their distance from me as much as possible. This was about six months ago.   
Then about a month and a half ago, we started talking a lot more. This was right after I broke up with my boyfriend. I didn’t think they were interested in me or anything, but I liked the attention that they gave me.   
A few weeks ago, they told me that they wanted to get back with their girlfriend. This kind of blindsided me. I realized that I had a crush on them and didn’t want them to be with someone else. This hurt because I was hoping that they’d develop feelings for me instead. I know how narcissistic this sounds.   
They’ve gotten back together with their girlfriend and have told me how happy they are. They’re still trying to message me and get in touch but I just don’t want to talk to them. It hurts and now I’m listening to breakup music even though we were never a couple lol