Why can’t I just forget him?

I have tried so hard to forget about him. I just can’t. I was going to finally tell him how I felt but I can’t find the courage. He has an on and off again girlfriend but I never really know when the right time is for me to say something. I’m just suffering. I can’t forget him. I have tried to move on and it just doesn’t work. I’ll probably always wonder what would’ve happened if I had told him. But I just can’t. I never know if it’s the right time. At this point I jsut want to let him go or something. I don’t know what to do at this point
Why can’t I just forget him?
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