Married woman in emotional limbo: Seeking advice on love triangle with husband and colleague

Hi I am 38 year married woman with one 12yr boy and living in joint family. I am doing everything very honestly and sincerely as a lady does as housewife but I never got love, respect as wife from my husband and few years after our marriage I had seen changes in his behavior and day by day he is getting very rude towards me. So I decided to enquire the reason behind these and came to know that he is having affairs with someone whom he is treating as his wife and giving everything to her as his wife and also wants to marry her. I told these to our parents and after talking with him he assured of not continuing the affair. But after that incident I had not seen any change in his behavior and still acting in the same way. I told these to my parents but because of some compulsion I decided to accept it and continue it the way as it is but these is very difficult for me to accept these and continue these relationship. In my schooldays I likes a boy, we love each other but after my marriage we had never been in contact with each other and he also not contacted me respecting my decision.But after these incident I contacted him to know how he is and came to know that he is still unmarried and waiting for me and I told him about my married life.As he loves me very much and still wants me as his wife and told me that he will accept me as I am. As I also loves him a lot and after knowing that he is still waiting for me its become very difficult for me live without him . I remain honest in my married life but after these incident I dont want to live here and also unable to leave because of family condition and also because of the society we lived in but now its became very difficult for me to continue these married life. We shares everything with each other . He respects me and my feelings and loves me a lot and I feel that he is always there for me and will support me in all respect. Kindly guide me what shall I do.