This may just be me, but I’d leave out the middle sentence about maybe we could both feel this way. It isn’t on you to tell her how to feel. Honestly, if my xh said that to me, it would irritate the crap out of me and I’d probably respond defensively. Just tell her how you feel (which you do control), that you’re happy she is finding happiness, but you’d prefer not to discuss personal things because it just doesn’t serve you well to hear about her dating life.
Me 52, H53 Bomb drop 9/29/2014 Divorce from XH final 12/17/2014 Marriage #2 12/31/2019 5 adult (step)daughters (3 from XH's first marriage, 2 from current H's previous relationships) 6 grandkids