I have such a messed up family..:(

I recently have caught my sister and husband having sex in my bed. It's a long story but anyways of course I kicked him out and im not talking to her anymore but now from what I'm hearing they are actually dating now. Wtf is wrong with the world now and days. He's my high school sweetheart and im 26 weeks pregnant with our first baby. Idk where to turn to anymore :(