I've been really conflicted on this matter. I'm upset with my mom for getting with her affair partner 2 months after my dad died. I started to keep communication to a minimum, but my sister is upset that I can't get over it. I need outsiders insight to decide if I'm being too unreasonable. TW: ABUSE AND SELF HARM.

This affair split my family when I was 13, I was the one to walk in on them, and I was the one who told my dad. I've always carried the guilt of breaking up my family, causing my mom to get sent to the hospital for domestic abuse, alongside a decade old hatred for my mom's affair partner. All I wanted afterwards was for my family to be together again, but that never happened. My parents were only civil to each other until my dad's health started to decline.

My dad got terminally ill 2 years ago, and passed away last August. A week before my dad passed, my parents were making plans to get together again, and spend his last days with each other. However that never happened, and 2 months later when I took my father's ashes to my parent's hometown, my mom admitted she had a secret boyfriend. I found out on accident once more it was the same guy from years ago.

Now, I can't seem to bring myself to speak to her. Especially since she's expecting my blessing to get married to him. I just don't think it matters, she already made her choice. I've been to therapy to process this when I was younger, and nothing came out of it. I did some really dumb stuff to my body to cope, and my mom knows how much this affected me growing up. It feels like a massive slap in the face that was in the making for a decade.

My little sister told me she's really upset how she now has to avoid talking to my mom in front of me now, like how she does to my older brother (who hasn't spoken to my mom since the affair came to light). She said how she doesn't want to be in the middle, and to just accept that my mom is happy, something she deserves after years of sacrifice to us. I told her I just need more time, but I don't think I have it in me to forget. AITAH?