You said it was really just a casual question on a boring afternoon, simply wondering what was the purpose of his wanting a week away from you thinking about it.
Well, perhaps he doesn't want to get too emotionally involved with you? Perhaps he's been hurt before in some way and knows it can be dangerous to lose control? Perhaps he's really very selfish and just doesn't like the idea of maybe ending up getting deeper and deeper and eventually sharing his life with you and having to make compromises for any woman? Perhaps he doesn't feel that any woman is worth losing complete independence and freedom for, if it came to that? Perhaps he' was very content being a bachelor before he met you? Perhaps your financial situation concerns him? Maybe you've got little or no savings and he has? perhaps he isn't keen on spending money on you for going out on dates? Perhaps he feels inferior socially and isn't at all comfortable that he'd be a disappointment to your family?
Perhaps he has a very low sex drive and other than nice company at a time of his own choosing, preferably, women have never been that important to him? Perhaps he fears you could become very clingy and he finds that off putting because he never wanted a woman dependent on him. It's too much of a responsibility for his liking?
He must be saying to himself surely, "Can i live quite happily without this woman in my life? Or do I need her? Really though? But where would all my inner strength and self-sufficiency have gone if i were to start thinking I have to have her? I don't really need her, do I? She's going to be an added responsibility. My life is going to get hugely complicated and changed if i develop this relationship further. She seems quite keen, actually let me sleep with her, so she must be! Perhaps my not doing anything in bed with her will warn her that I have serious doubts that this is for me. I need time. I just need time to weigh up all this. If she'd just give me time on my own to work all this out."
I think he'll be weighing the pros and the cons very carefully of you in his life, intruding into it, so to speak, and will be trying to decide what is best for him, not you, him. Maybe he doesn't have any strong desire for any woman's love? Maybe he just isn't very emotional or needy at all and has some fascinating interests, and male friends that take up lots of his time.
He simply can't be very physically attracted to you if he could lie in bed with you, a woman he likes, and one whose body he hasn't explored and never had sex with (always a thrill for many a man!)... yet he could resist all this and not do anything? It's amazing! Did he not even get an erection of some sort by just being close beside you? Did he not even get aroused? If nothing else, he must have a low sex drive. I don't think this is at all usual for a man to be like that. You must have been shocked that nothing happened! Did you not feel insulted?
It sounds like he's just not really looking for a girlfriend particularly, doesn't really need one but you've appeared, a bit of a complication for him and he needs to think about it and all the implications of a relationship other than platonic friendship with you. He doesn't want rushed or swept off his feet emotionally by you or anyone. He wants logic and control in every region of his life. He wants to be his own man. He maybe feels that if he ever needs a girlfriend he'll be able to pick one up without too much difficulty.
None of this is very flattering or upbuilding for you. I'm sorry. But anyway, I'm obviously only guessing about his thoughts and might well be far wrong.
On a lonely afternoon I've tried to answer your exact question as honestly and as best I can. It's a case of puzzling out the thoughts that might be going on inside another person's head. Not very easy. Impossible, in fact.
So how do you feel about this? Would you really like a man to fall helplessly in love with you? And not be able to resist you? Don't you want romance of some kind? Rather than a man making calculations about how you might complicate his life?
Or are you not really that bothered about needing a man in your life? I just wondered.