I know we are both clean. We are engaged and I know he won't lie to me . So I don't know why it burn's??

Lack of lubrication.

i know we are both clean. we are engaged and i know he wont lie to me . so idk why it burn's ????

You both got tested and have the results to prove it?

Probably lack of lube. Not uncommon or anything to be worried about. Pick up some Ky and have at it.

I agree with the lack of lube. But it could also be a yeast infection. Sometimes you will have no other symptoms except that sex is painful or that it feels like it's burning after sex.