Should I tell my bff?

J

So, kinda long story short. I've been with my husband for about 13 years, married for 5. We both practically grew up with each other and each other's family. We are particularly close with one of my husband's cousins, we have housed him and supported him financially on many occasions - he's a great guy (no I'll will against him).I give you this history because he is still very active in our lives.

Anyways, he was with his girlfriend (who happens to be one of my best friends) for about eight years. They separated mutually and on pretty good terms. My friend basically outgrew him, she was ready for a life he wasn't ready for.

They've been separated for about two years now and he just got into a relationship. I'm debating about telling her because I feel that she's holding on to a glimpse of hope that they're getting back together. I'm genuinely happy he's moved on, and I want her to move on as well. I firmly believe their break up was a good thing, and that they've grown up since they've separated.

I just don't want her to be upset that I didn't tell her, you know? What do y'all think?