Sexless marriage

Hi ive been married for 15 yrs. The last 2 of which i can count on one hand how many times we have done anything sexual. She says she just doesnt feel like it anymore. No matyer what i say or do try to start with a relaxing massage she just says thats enough. She said she just quit wanting it. She used to love sex more then i did. For yrs i could hardly keep up to her then it was like a switch qent off and she wants nothing to do with sex. I love her and she says she loves me ihas nothing to do with that but i need to feel some sort of sexual pleasure from someone. Im actually thinking of looking for someone that just wants a quick fling. I dont know what else to do im getting into a very depressed state more than anything ive told her how attra tive i f8nd her that shes sexy. It just doesnt help. I find myself watxching porn looking at pics and i know i need real phsyical contact more then anything. At this stage id even be happy to just chat with another women just to get some kind of conversation going. If anyone has any advice im desperately listening.