thank you personathome I know how lucky we are to have such a good relationship, its a lot to do with maturity and yes of course trust and respect, we both know what we have is too special to risk by some meaningless affair. having said that we have discussed that if god forbid one of us found we wanted someone else more than we wanted each other then we would not deceive, we would end the relationship first because of the respect we have for each other. doubt this will ever happen cos we are best friends and partners with a whole history together, good and bad! lots of 'in jokes' and memories after 25 years of marriage that would be meaningless with someone else.
All I can suggest is that you need to sit down together and have an honest and open discussion over what you both feel and what you both need, what you aspire to in your relationship. perhaps counselling would help? but first you need to decide if being together and working on it is what you want? you are capable of it if you can be open and honest and listen to each others needs, where does the suspicion from either of you come from? why can neither of you believe in each other? what will it take to build a trust?
looking back I thought I was in love with previous jealous partner but tbh we were quite young and part of it was that I clearly was not ready to be with just one person forever at that stage, he must have sensed that, he stifled my fun and I felt old before my time which if he was the right one possibly would not have bothered me so much. Saying that, no one should ever have to pretend or lie to live a normal life. Being attracted to someone is normal, everyone does it, the phwoar factor is fun and having that glance from someone that makes you feel like you are stll attractive, the mild flirtations that go on around us all the time make life a giggle. you can flirt with no intention of acting on it, you can go phwoar without ever acting on it, its all part of normal life.
I read about situations where girl will cover her blokes eyes when he watches TV if a pretty girl is on screen, or a bloke sulks for a week after girl s eyes light up over a hunky male body on screen. really truly if such stuff is such a threat to a relationship then the relationship is not strong enough to survive and should be binned or worked on. Honestly person you deserve to be trusted, and if he is the one for you, you will be trust worthy. No one strays if they are truly happy and with the right person unless there is some other deep seated stuff going on. constant suspicion erodes a relationship, try and sort it or you will never have the contented full and happy respectful relationship you both should be enjoying.