Is it normal or even ok?

ok before anyone here judges i think you should all understand that i love him more than anything and for those of you who are truely in love with someone then you understand that with great love comes great sacrifice so please be respectful that i dont and im not asking for anyone to be agressive.

Ok so i met my fiance around 2 and a half years ago at work and we instantly hit it off, he made me laugh and smile and we got to know each other, later on family dramas caused me to see his protective side and him comfort me all through this time i fell from a crush to in love so at my work christmas party i planned on telling him about my feelings, this was also the night his engagment was announced. Him and i remained friends up until his wedding with flirting by both of us which neither one of us noticed until much later, on my birthday him and i had a massive fight leaving me in tears so he picked me up from work early and gave me a gift and told me he loved me along with our first kiss, over time our bond grew closer and we new that as wrong as our love was it couldnt be ignored so after getting engaged and sleeping together i met the wife and we hit it off and were good friends until we told her when she got upset as one would and she still spoke to me but was disappointed so now me and my fiance are letting her pretend nothing is going on but slowly letting her get used to the idea which seems to be working, this way works for us because it allows me and my fiance to have our relationship and him to be with his wife aswell and also means i have a halved load of house work and a friend right there i no its not ideal but can it be considered normal? And if no one is hurt is it actually wrong? I mean at least we can all now have a trusting marriage.