My issue is with the 'when the time is right' part, because I think that sounds as though you are 'waiting' for this to resolve. I think the message you want to give is - whilst you remain involved (in whatever way) with her, you and I won't have a relationship. We will coparent and that will be all.

Ways of handling 'it' that I have read on this board include things like:

Please don't do that. It isn't appropriate given the state of our marriage right now.

No - whilst you are involved with someone else, I don't feel like being romantic with you.

Please stop that. I'm not willing to be with you that way while there's a third person in our relationship.

I think the important parts are the boundary setting and the clear message why. I don't think you need to add the reassurance parts. You can say all of the above firmly and pleasantly of course..

T 13 M 7
Me 48 H 46
SS 15
BD 7.14 PA
D final 5.16 (H filed)

We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus