How long does a friends with benefits usually last and how do you know when to end it?

Question

How long does a friends with benefits usually last and how do you know when to end it?

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I have been "seeing" this guy off and on for almost 5 months. We hook up at least once a week. We have been on a handful of dates (movies, lunch, dinner and he even came out with me to karaoke even though he hates it.) I sleep over regularly.
He has told me before (like 2 months ago) he has a "feeling" that makes him not see anything past what we are. He can't explain it though.
As far as I know, he doesn't see anyone else, though he does talk to other women.
We can talk for hours, he is extremely affectionate, we cuddle and hold hands after and during sex. I am confused by him. I think he is scared of commitment.
But, I need a commitment. It's been going on long enough that he needs to make up his mind. I don't know how to talk to him without scaring him away. He doesn't like to talk about feelings at all. I know I am going to get more hurt the longer this goes on.
I have been on a couple dates (non-sex dates) trying to meet someone to make me forget about this guy. The newest guy has potential.
If I can't get some kind of commitment from the guy I've been 5 months with, how do I allow myself to get over him? (this is a question more for the ladies.)

Updates:

I don't sleep with anyone else. He says he doesn't. We're both clean. And I'm on the pill.