Should I reach out to him?

So this guy and I dated for three months long distance. I broke things off. 8 months later he started dating my friend. 5 years later they’re still together not married no kids. For some reason I can’t stop thinking about him. I’m thinking maybe he’s the one for me and im the one for him and maybe he doesn’t like my friend cause why hasn’t he propose yet? So should I text him or not?
Should I reach out to him?
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