I need help!

my fiance and I have been having sex every single day for the past month-and-a-half. it has been amazing he makes me come to three times but now I have been dry for the past two weeks. tried toys and that helps but once he is gets inside of me and stars thrusting it gets dry again! it's super duper frustrating because it hurts and I mean I love my fiance he is the best man that I have ever been with and he is super amazing with my daughter. but I can't help but think that something is wrong because I just cannot get wet. we've tried Lube we've tried him going down on me the lube does help but I'm sensitive so I get rashes and I'm just sick and tired of this can someone please help me!!!!