I can't forget about a guy I used to date?

Like help! It's like no matter what I do j can't stop thinking about him, I still have feelings for him. We used to date for a half year but it ended abruptly due to misunderstandings a half year ago. I would say it was mostly my fault and I feel like I owe him an apology sometimes. I have been with other guys but despite that he doesn't go away. I slept with someone else and was thinking about him then woke up in someone else's arms wishing it was just him, like do you get my point? I find myself missing and thinking about all the fun stuff we did together. He has been with other girls too and flirted with me then stopped. He always greeted me then he walked past me like I didn't exist then suddenly started greeting me again. He tried getting me to dance with him recently too but I couldn't. My feelings are messed I can't just dance with him out of the blue. I don't like bringing up the past and I'm not necessarily trying to get back together with him but oh how I miss him! I feel like there is no other guy I want. I just can't let this one go even though I'm trying to.
I can't forget about a guy I used to date?
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