Help please

I’m 20 years old and I have absolutely no sex drive. I’m scared there is something wrong with me, when my fiancé and I got together we were having sex every time we were together and over time I just stopped wanting it. I love him more than anything in the world and there’s nothing wrong with him and the sex we have is amazing but I have no desire anymore. It’s ruining my relationship because he thinks it’s his fault. I need help finding way to be interested in it again. I’m not sure what there is to do.