I dated his best friend before I met him what do I do?

Blondie-411
I have this guy friend who I have liked for awhile now. We have so much in common and I swear he is the perfect guy for me, but there's one problem I dated his best friend for 5 months. Now its not what you think I dated my ex and then met this guy. Things didn't work out with my ex long story.I found out his friend liked me after awhile, but he ended up back with his ex. Then they broke up and we were both single, but he didn't seem interested anymore, but I still was and still am. We hang out all the time because we have the same friends and we are the only single ones in the group. He is always leading me on and flirting like he does have feelings when were around each other, but when were not around each other its like I don't exist. We have never went on a date or ever been alone. I don't understand why I like him so much if he doesn't feel the same. I've been single now for 9 months and haven't went on a date not once sense my ex and I broke up thinking there is still hope with my friend!
I dated his best friend before I met him what do I do?
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