Still Heartbroken Seeing my Ex.

So apparently I saw my ex again today because the fucked up passenger vehicle I'm riding stopped in front of the coffee shop he's always hanging out. I saw him with a new guy, lighter complexion than I am, more handsome than I am, and more build with huge biceps (because I'm a body builder?). It's not really my business to know if that new guy he's eating with is his new bf, fubu or just a gym buddy but why the hell am I still affected or jealous? Something inside me hurts so much seeing them together and thoughts sprang out like "why". Our break up had no clear closure though so I took his coldness in silence wayback. Now seeing that situation, I still feel hurt. Why? Help me get over him guys. Thank you.