How do I tell him I would like to see him again if the time is right?

So there is this guy that has an open long distance relationship. I agree to meet up with him and hang out a few times and we had very good connection and had so much in common. He is so sweet with a big heart and I felt like I could be myself around him. :)

I ended up having feelings for him and I told him how I felt. We said our goodbyes and I text him again telling him how I felt and he said “If our situation was different I would definitely loved to get to know you more, we definitely had some connection past physical. I will never forget our time”.

How do I respond without sounding desperate , but asking if I could see him again if the situation is right? Like if he ends up not being with his girlfriend. He did mention that he loved her, but didn’t see hisself with her in the future because she didn’t want kids.
How do I tell him I would like to see him again if the time is right?
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