Boyfriend of 1 year lying to me... just found out!!

I am 39, My soon 'was' to be fiancee is 42. We had a great partnership until i discovered last night he has been lying ....he has been using drugs behi d my back recreationally and going online talking to women and looking at pictures. I feel betrayed and like i do not know who he is anymore. Do i support and help and stay with him, or do i walk away? I need help....cant sleep, cant eat....i am a mess.

I understand you are upset and hurt and rightfully so. Best is to walk away. This was not the person you wanted to be with, he only portrayed himself to be what you like. Go out and try to find a person who is more genuine. And why are you losing your sleep and food over such a liar and a fake person? If you had got engaged to him imagine what your life would have been?