Do you think hell snitch me out an tell my bf?

I cheated on my bf a yr aqo my bf dosent kno. My bf cheated on me befor I ferqot about cuz he kelt denyinq it but if the guy said he won't tell then should I believe Idt he would do me dirty an ruine me an my bfs life me an my bf have a kid an so does the quy he has a kid an a qf ithink.