how do I know if the guy I'm sleeping with will ever want to be with me?

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So I'm 18, this guy who I'm kind of falling for is 22 Stuart... basically Stuart mailed me on fb one time we got chatting and swapped numbers. I had a boyfriend Tom so I was only being friendly with Stuart every time me and Tom had a blip Stuart was always the one to be there for me and in the end we become very flirty over texts so I left Tom because he was a dick and now I'm meeting Stuart!

Me and Stuart are really good we spent a few nights together and met up a few times before we started having sex. Now its been only just under 3 months and we've been on dates I've met his family he's usually a party animal but he takes time out to spend with me.

BUT he says he wants to 'take it slow' and not be in a relationship with me yet or even start 'seeing' each other? I'm 99% sure he isn't using me for sex because we spend a lot of time with each other and his family have said he never introduces girls to them.

I can feel myself 'falling' in love with him he's actually really lovely to me, but just won't go that step further. I'm not 100% sure if I want a boyfriend anyway, but I'd like to know that he is kind of mine by putting some sort of label on it instead of everything being his way.

He's got everything he could want other than the commitment and so do I but I need some security, although I don't want to be demanding and push him away.

WHAT SHOULD I DO???