What to do ! I never want to have sex I need help

Nikki
So for the past 2 years I haven't had the. Desire to have sex the thought of even being touch gets me mad and I feel bad for my fiancé he gets so mad and tells me that I have a problem when we first got together I dressed sexy and I liked having sex but now has been I don't even want to show skin what should I do  don't want to split up over this please help