Why does he kiss me, but hasn't asked me to be his girlfriend?

whenever we're done hanging out, he always kisses me goodnight or goodbye, but he hasn't asked me to be his girlfriend. we're pretty much dating (flirting, hugging, kissing, exclusiveness etc), except we're always with another couple and rarely by ourselves. He doesn't have an income right now, so I was thinking that maybe since he's unable to actually take me out, he hasn't made any official moves like that. But I don't care about going out and showing off our relationship, all I want is me to be his, and him to be mine, since this has been going on for a couple months. (we've known each other for over a year)

And when I say we're exclusive, the only other female he talks to is his mother or his sister, so I know he's not trying to play me.
Why does he kiss me, but hasn't asked me to be his girlfriend?
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