Why is that always happening to me?

i'm sick of being weak and fragile, whenever I make a step forward and gets better he pops in my thoughts and my dreams, i'm so tired and have no energy to go through overthinking about him again. why won't he leave my head? why do I dream of him although I stopped thinking of him? it's been a long time and he seems enjoying his life why does he intrude my dreams and thoughts.. I know I sound pathetic but I've no one to share this with.
i'm not into him literally I've already moved on and ik someone now but he keeps crossing my mind and I start overthinking whether I cross his mind too or not.. i'm helpless..
Why is that always happening to me?
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