I know my W and OM are still in some contact - not anything like it was, but can still see the phone bills and there are still occasional texts (1 every 2-3 weeks) from her to him. None from him in response. It indicates that she is still not over him and is still probing once in a while just to see if she can get another hit of her addiction.
I passed his car in the gym parking lot the other day and wanted to burn and bury it - but it would not have fit in a tin can
Anyway, I think you have to believe him that it is over, but know at the same time that he will probably keep relapsing - probing or trying from time to time - it's what addicts do unfortunately.
Me 42, W 39, S8, S6, S2 M 11y, A & ILYBNILWY 11/08 Walking away from a bad situation.