The whole MLC/addiction thing is a difficult thing for me. My H is not having a PA with one person - but he's been sleeping around with strangers - and has been labeled by a counselor has having an addiction or compulsivity. I think that these behaviors began really around when his MLC started. There are a lot of similarities between the behaviors of addicts and MLCrs. Ultimately the MLCrs' reality is not in sync with the rest of the worlds'.
I don't know which is more painful - an H who is involved in an affair or an H who sleeps with strangers. I've asked myself quite often - "if he was so unhappy with me wouldn't he have looked for someone to replace me?" - but then I think he must hate me so much that he's done these heinous things to me as punishment. Then I just think of him as lost.
Read all of the same books - one really good one is titled "Deceived" by Claudia Black - I think it is the best one around.
M-48/XH-48 M=25/T=28 years Ds-24,22/S-18 D - 3/11 A Day at a Time