Trippin' and Sophiesmom, thank you so much for your feedback!

Trippin, I am so glad to hear it is working out for both of you. You seem happy and that brings joy to me. Indeed, having a no-pressure non-relationship sounds like an interesting and doable thing. I'll give this a thought.
Sophiesmom, indeed, I have often felt like he is guilt-ridden and that he believes he is betraying her by enjoying the time he spends with me. I think this is natural but for the moment he does not want to talk about it so I am not pressuring him in any way.
I was thinking about maybe laying off the idea of a "relationship" and being there for him as a friend, first and foremost, because that's how we started off. I think he needs that more than the complications of a love affair right now. As for me, I think he's a great person and would hate to lose him, which is why I believe it would work out best for me too to keep things simple for the time being. He is clearly not ready for something more.

Intimacy is a misleading thing and sex, more often than not, especially for women, it complicates things and emotions.
What do you guys think?
Thanks again!