I friendzoned him. Now he has a girlfriend but I have feelings for him. What do I do?

Long story short, a close guy friend of mine always asked for sex. I don't want sex without a relationship and made this as clear as possible to him. I'm almost 100% sure he liked me but he was awful at showing it. Now he is taking to a girl (not dating yet, but close) but I have feelings for him. Do I pursue him or let nature take its course and wait for them to breakup and then go after him?
I friendzoned him. Now he has a girlfriend but I have feelings for him. What do I do?
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