He wants me to date his best friend?

1,5 years ago I was dating a guy, I still have feelings for but we stopped having contact by the time he met his current girlfriend. They've been a couple for 1,5 years now and for some reason I just can't forget him. Of course I met a few guys in the mean time but he's always in the back of my mind.

Yesterday I met him when going out and he was really happy to see me but he was constantly talking about his best friend & that I should date him because he's a great guy and so on..
I was really confused as I am interested in HIM and not his best friend.

Do you have an idea why he wants me to date his best friend?
I mean I wouldn't want my best friend to date a guy I once had a big crush on?

I hope you understand what I mean & I appreciate every opinion
He wants me to date his best friend?
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