Partner lies to me constantly

Hi, I just don’t know who else to talk to about this. But my fiancé lies to me constantly about stupid stuff, small, big , no matter what it is.. even about dreams they have …. Because they tell friends and then friends tell me when it’s brought up on conversations.. and I look like the idiot.

I feel like my partner is just a compulsive liar… I have found out so many things she’s lied to me about.. and I just don’t know what to do…

I’m over it all, it’s giving me anxiety and I am unhappy. I don’t trust anything that comes out her mouth anymore.. sometimes she will tell me one thing and then our mutual friend another thing.. and then we find out she’s lied to one of us…

It’s just weird…

Has anyone been with someone like this before? Please give me advice?

I have caught her out on them, and then she always makes excuses to try cover a lie up with another lie.

I don’t see myself marrying this person when nothing she says is honest and truthful.