my heart goes out to you mrsjellyby.
i haven't read all the replies so i am sorry if this has already been said, but if a man is happily married he is not going to be unfaithful to his wife let alone carry on a long ongoing affair. i think your married man is taking the p*ss TBH, the affair started 8 yrs ago, if he loved you that much he should have left shortly after he realised he had feelings for you. it is not fair on you, his wife or kids that he has stayed so long in a loveless marriage.
i am speaking from experience, although i was not actually seeing him while he was married, my fiancee had been married for 11 years before we met. he had been very unhappy for several years, him and his ex just didn't get on on any level and she would constantly put him down and belittle him. so he had just been coasting along because he was afraid his wife would stop him seeing their DD if he left, plus they were up to their eyes in debt together and he felt a sense of duty to stay there to provide for them all.
we had been friends for months before getting together (we played in a band together) and he kept telling me and the other people in our band how unhappy he was. i was with someone else at the time. i split up from my ex and a few months later, one night he (my now DF) told me he couldn't stay any longer because he had feelings for someone else. that someone was me. i was shocked but very happy as i had secretly liked him for a while too (although NEVER told him or made it obvious). however, i told him that although i liked him, and was flattered, i would only think about starting seeing him when and if he split up with his wife. i did not in any way pressure him to leave, or expect him to, i left the ball totally in his court as i did not want to be responsible for breaking up a marriage. he assured me that i wasn't, that there had been no love in his marriage either way for years, but that having such strong feelings for someone else had been the final nail on the coffin to make him realise he had to stop wasting his life with someone he didn't love.
he started getting his affairs in order (pardon the pun) at home and left within a few weeks of telling me how he felt about me. and once he had left and moved into his own place we started seeing eachother.... against our better judgement we fell head over heels in love within weeks and now 2 1/2 years on we are engaged with a 4 month old baby DD.
sadly it has not quite turned out as much of a happy ending as we would have liked because his ex has totally poisoned their DD against us both and now his DD refuses to see him and he hasnt seen her for a year.
so i have to say that even if your man does leave his DW for you, it will absolutely not be an easy ride and in all likelihood his kids will hate you both. i am sorry to be harsh but that is normally what happens. it will also be very very hard for you to deal with the guilt that will ensue. i recently had to deal with receiving a message from his daughter saying "its YOUR fault my mum and dad split up!!" so you WILL be blamed and it will be bloody awful.
i wish i had some actual, practical advice for you but all i can say is that if you two are really and truly meant to be you will get through it all. but first he needs to grow a pair of balls and end his relationship with his wife. and then, and only then can you all start to try and sift through the mess and all move on with your lives.
i hope this has helped. feel free to CAT message me if you want to talk more.
((((hugs))))) xx