you really are confused aren't you, before his ex said anything, did you suspect he was up to naughties with anybody ? is your sex life just as it was,how often you do it I mean ? if it is,it is very unlikely he is doing anything wrong, sounds to me like her plan to split you up is working, and if you are beginning to distrust him, Why would you do that if all is perfect ? if somebody told me my wife was having an affair with an ex, I would laugh at them, not because it would be impossible,but because I trust her 200%, hope you sort it,for both your sakes, good luck, Ray