Sex problems with my wife

This is the first time I am posting. I am in my mid thirties and I have been married for a little over 2 years and been in a relation with my wife for 10 years. The problem is that while I respect her and know she is a good person our sex life is very boring. She never wants to experiment and try any fantasies and after the first few years we started having less and less sex. After marriage we got to a point where we have sex like once every 4 months, sometimes even less. I do not feel physically attracted to her anymore. Problem is I have a high sex drive and I feel attracted to other women all the time but when I look at her I see her more as a good friend. I do not want to cheat on her and I feel I cannot have kids with her as I do not want to bring kids in this life with us having this huge problem. We split for a couple of months but now are back together after some therapy. However I feel that nothing has changed and we still do not have any physical attraction. I feel like I am wasting my life but I do not know what to do. Should I leave her because of sex? I feel bad about this as she is a nice person but I think she can never satisfy me sexually and sex is an important aspect of my life. I crave to be with other women but I keep holding everything inside me as I do not want to cheat on her. Life is very sad and unhappy right now...what do you think I should do?

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