When a guy says he's not ready what does it mean?

When a guy says he's not ready for a relationship what does he mean? Know a guy in another state I really like when we were together he said he isn't ready for anything just yet, but he treated me amazing like his girlfriend and I think there are feelings there. I know he has like f-buddies and such which I don't like but can't change it. Does not ready mean he still wants to have sex with a lot of other people but likes you? Will he ever be ready with you. He says I'm wifey material I just wish he would let us have a chance instead of wanting a lot of girls.
When a guy says he's not ready what does it mean?
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