My wife of 35 years cheats aged 59

I don't know how to start this but after a long and fairly happy marriage my wife Barbara is now getting her sexual gratification from someone other than me. About 2 years ago Barb started working as a freelance cleaner in our neighbourhood,it was mainly couples who worked full time but one of her employers was a retired businessman in his mid 60s,he was a widower and according to Barb a pleasant man.As the months passed I noticed Bob's name kept cropping up in her conversation(that was his name)and on the days she cleaned at Bob's she seemed to take more care in her appearance.Now over the years our sex life had been pretty average apart from my constant wanting Barb to let another man shag her and whenever we made love I would try to persuade her to let another man into our bed,she would sometimes go along with my fantasy and even at times get quite enthusiastic but as soon as we had finished she would become very cold to any idea I had of letting this become anymore than a fantasy.To me though it was my one burning desire to see the wife that I loved naked on our bed with another man,this was to become the beginning of the end of our sex life and in her own words "I was some kind of pervert to want another man in our marriage" All this was to change about 18 months ago,Barb came home one evening and seemed very distant,I knew something was very wrong then I realized what day it was,it was Tuesday one of the days she cleaned at Bob's the feeling of overwhelming jealousy hit me and as I asked her "its Bob isn't it" I knew straight away by the look on her face that she had done the one thing I had always wanted to see,she had been shagged by another man,Only I hadn't seen it and it wasn't done to please me.The butterflies in my stomach were making me feel almost sick,but at the same time I have never felt so excited as I listened to what had happened. Bob evidently was always paying her compliments and over the weeks would make comments on her appearance and sometimes pat her bottom and say things like what a lucky man I was and if she were his woman he would make her feel like a real lady,anyway one particular day she was at the sink washing up,when she felt Bob behind her then felt him pressing himself against her bottom but instead of pushing him away and making a joke of it,she turned and Bob kissed her on the lips,now as I said we had not made love in months,so as she felt his lips on hers and his erection pressed against she responded and met his kiss with hers(remember this is how she told me)then Bob took her by the hand and led her to his bedroom.Once inside he lowered her onto his bed and expertly undressed her as soon as she was naked his mouth were on her large breasts making her nipples harden,then very slowly he moved down her body until his face was in front of her open pussy and his tongue moved up and down her glistening slit,as he opened her up with his tongue she felt him kicking his trousers and pants off,then stood in front of her and for the first time saw his erect penis(now as you can see fro my profile my cock is pretty small)and Bob's was a good two inches longer and much thicker with an angry looking head and as he knelt between her open thighs and nudged it towards her entrance she felt herself being filled like never before and as he fully entered her and began the familiar thrusting movements we had a thousand times,she felt herself beginning to orgasm (something she rarely did with me except with my tongue)then she felt his hot seed erupt deep in her womb.As they lay talking afterwards he told her he wanted her to move in with him,but she told him she still loved me in a funny sort of way.When she finished telling me of her infidelity,I admit I cried and begged her not to leave me and she could carry on seeing Bob,but would she please tell me all the things he does to her,this is how it has been now for months and my only consolation is when Barb is in the right frame of mind to give me some details.