Confused Feelings

So my ex boyfriend broke up with me about 5 weeks ago now and I've been struggling through it and we're still trying to be friends, and honestly I'm doing better than he is right now. But recently I've had these weird feelings for a friend of ours. I got a hint from one of our friends that he might be interested in me and so I subtly brought it up in conversation and he said he is interested. At first he didn't know in what way though so I told him, obviously, I'm not ready for a relationship again yet but I'd be down for a casual thing if he wanted and told him to let me know when he figured out what he was feeling.

So he ended up telling me that he knows I'm not ready for a relationship and that he doesn't know if he wants to do a causal thing because he doesn't want to make it weird between us. But I've had casual, fwb sort of sex with one of our other friends before and it has never been weird (he knows this) so I know it wouldn't be weird between us.

Now I can't stop thinking about it. I'm sort of interested and obviously not interested in a relationship but I have some weird feelings for him, I don't even know how to describe them. Should I bring it up with him and talk to him about it or should I just leave it? He might be sleeping at mine next weekend so should I wait till then or ask him now?

Help!