Cant stop thinking about him 😔

I like this guy & I've liked him since the 7th grade.. We first became friends, then we became best friends.. & idrk when he started to like me, but in 10th grade we had like every class together except for 2 & we would be flirting with each other & we even got told tht we sounded like an old married couple. The summer after 10th grade, he messaged me saying tht he misses me & I said tht I missed him too & he asked if he could ask me a question & I said tht I didn't like those kind of questions & he said oh & tht was it.. (I said tht I didn't like those kind of questions because I thought tht he was gonna ask me an inappropriate question), but anyway.. Thinking about it now, well not recently but awhile ago its pretty obvious tht he was gonna ask me out & I think to myself *wow, how can you be so freaking dumb?!?!* & last year I sent him a really long message confessing my feelings for him, but he said tht it was a long time ago, no hard feelings & to not send him anything like tht to him again & tht he has a girlfriend tht he loves very much.. I said ok, sorry. He said tht I was fine & I said ok, but I didn't know tht he had a girlfriend because we lost contact & haven spoken in like maybe 6 years if tht. But anyways.. It was kinda humiliating because then his girlfriend started messaging me off of his profile & we got into it, but then she blocked me from his Facebook. But weeks after all of tht one of my other friends said tht he was single now & I just asked what happened & they said tht they didn't know & I said oh, well. I've hadn't talked to him since, because tht was humiliating like I said & he probably hates me because of tht but he also probably hates me because I had to move & I didn't tell him about it, because I thought it was gonna be really hard for me to say goodbye to him but tht wasn't smart to do. I can honestly say tht I was really stupid & I have no idea why I even put this on here, because its pretty obvious tht I blew it with him 😭. He's always on my mind especially recently & a lot of times he'll be in my dreams & I don't know wat it means ? Like Idk if its like a sign or something ? I just feel like an aweful person & dumb... & I feel worst every time I think about it & idrk how thts possible but I do. & I didn't mean for all of tht to happen & if I knew he had a girlfriend.. I wouldn't of done tht because I'm not like tht. But like I said Idk why I keep thinking about him a lot & tht he'll be in my dreams ? **UPDATE** so.. Like I've been doing fine because I've been talking to another guy who also went to the same school as me. & I've been fine & not thinking about the other guy tht I talked about, but like Idk what's going on because all of the sudden the guy tht I've been talking to left me on read twice on Snapchat, but he still looks at my stories so Idk what's going on or what to do ? But recently I've been thinking about the other guy & Idk why ? I need to stop thinking about him because I think he hates me & whatever, but you know it doesn't help tht I watch sabrina the teenage witch because Harvey reminds me of him. I really don't know what to do ? Oh well I guess...