I cheated with a very dangerous man...

I know I'm really gonna get dragged for this. I made a horrible decision. I had been going through some depression because I was working full time and my husband was working part time. I saw my kids less and felt like I had less time to do what I wanted. My husband worked only 3 days a week but he worked 12 hour shifts as a medication AID. I worked literally 6 days a fucking week! I'm the breadwinner and was bringing in more money. I also felt disconnected from my husband and he was battling depression and PTSD. I should have communicated instead of cheating. But I had an affair with someone who worked at his job.... It lasted 4 months and I recently cut it off but this guy won't let me go. He's become super attached to me and keeps messaging me from other numbers saying my husband doesn't deserve me. I was worried he was gonna tell my husband but I'm worried its worse. My husband called me from his job saying someone slashed his tires. I don't want to make that connection. I started getting weird messages saying he wants me to leave my family and start a new family and I don't need my family. I may be crazy but I swear I saw his car at my sons middle school.... I'm worried but haven't confessed to my husband. I don't want him to leave me but I'm also worried about him because he works with this man.