Sorry mate -- you're just at the wrong part of the story. It's not fair to ask S to wait for you, and it's good that R is out of the picture, and so for now you are a party of one.

Advice: you don't have to rush into person #3, but don't wait for S, either. Just take life as it comes. If you meet someone new, let it happen; if S & D run their course, you'll be there.

Time alone can be centering, gives you a chance to reflect on the past and work on yourself.