I cheated so now i feel he will do it to me.

I cheated on my partner of 6 yrs more than once with the same person, he still does not know about it,it went on for 2 yrs. Now when ever i go somewhere and what ever my partner does i feel that he is doing the same thing to me and it kills me inside to even think he would do that to me. Still to this day i fell like shit for doing what ive done.