Double betrayal, affair while I was pregnant…with a family member

I don’t know if anyone can relate to this, as I have lurked on this sub for a while and see a lot of posts of being cheated on while pregnant, a handful of posts of it being with a family member/family friend, but never of both. I feel extremely alone and like a shell of myself.

My partner had 3 APs during my pregnancy, and 1 when I was 2 months PP, each of them a ONS. This is already devastating enough, but the last thing I had expected was one of the women he cheated on me with during my pregnancy was a family member.

This family member came to my baby shower, would text me to give me support, and came to visit the baby multiple times after I gave birth. I had no clue she had slept with my husband just a month before. I feel so betrayed and broken.

It’s been almost 3 months since D-day and I’m just going through the motions. We both have started IC and my baby has been born and is the light of my life. We have been living separately but have been going to MC as well. I am so angry and hurt by my husband’s betrayal. But I can’t even tackle the amount of betrayal I feel towards this family member. I haven’t even dealt with it because any time I think of it I turn into a weeping mess. I don’t know how I will get through this.

I just need to vent and need support from others who have been through similar situations. I don’t know if I can forgive or live with this trauma. I don’t know if I can work this out with my husband, he has been doing everything right. He’s been reading books, podcasts, got a CSAT, and had sworn to never cheat on me again. He’s seen the amount of pain I’m in.

I am just living in a state of ambivalence trying to process this trauma before I make any decisions. I don’t know if this is worth saving, even though he is literally doing everything right. I just feel so stuck and hurt. I feel betrayed by my husband but even more betrayed by this family member.