My longest friend betrayed my trust

I have had a friend since 7th grade (Jen). I recently told her something very meaningful to me that I never told anyone but my therapist. last weekend she used that information against me and really said something completely hurtful. I was shocked. One of my other long term friends (Pam) was there and she was shocked too. Pam later asked me if I was ok and I said no. I don’t know how to get past this.

I’ve already committed financially to a vacation with the 2 of them and I am having a lot of anxiety about the whole thing. It’s a milestone trip for them and pretty important to Pam.

I don’t think Jen and I can be friends after this and I always considered her one of my closest friends. I am crushed and didn’t see this coming. Looking back there have been signs but I thought it was just her being high maintenance.

Now I have to get through this vacation which is months away. And I have to do it with dignity and not hurt Pam because she does not need to be in the middle of this mess.