Let me start with saying I have crushed on this guy my entire life. We even have baby pictures together. I realized that I loved him about 5 years ago. We dated for a while, it didn't work out with us being young and dumb, but we've always had feelings for and cared about each other.

My little stepsister (our parents have been married since I was 7 and she was 3) told my mom a few days ago she thinks she had a miscarriage.

She used my phone a while back for Facebook messenger. Her messages pop up every now and then and I usually just ignore them.

Yesterday, one popped up with her talking to someone about my ex. I was like "tf" and clicked on her messages. I saw that she had talking to my ex's mom a few weeks prior. My sister was saying she was hoping she wasn't pregnant. His mom asked "[ex's name] or [other guy]?" And my sister said she hoped it wasn't them.

I have a group chat with my sisters and said something like "I really hope neither of you have slept with [ex]." And all she said was "oops."

My ex's friend called and asked if it really happened. He said he was drunk and that she ,sober, had sex with him.

My first thought is "what if she miscarried the baby of the man I love?"

Idk what to do, I'm so angry, disgusted, and heartbroken. I don't care about him getting with other girls. It's the fact that my SISTER did this. I can't look at either of them. I can't talk to them. Idk what to do...