Dating

Why does my fiancee seem to not trust me?

Okay, so I and my fiancee have been together for 3 years. While at first, we were getting to know each other than we started to date, I never really noticed her trust issues. Looking back at it, when we first started dating and we were out in public, if a woman walked by us she would check to see if I was looking at her and she wouldn't open up to me about ANYTHING. I kind of overlooked it and deemed it as normal behavior. So a couple of minutes ago we just had an argument about trust in our soon-to-be marriage. Ever since I proposed to her, she has been acting a little funny. I noticed she distanced herself away from me, sometimes I would catch her staring at her engagement ring and her mopping around. As we were getting ready for bed, we both were just getting ready but we w weren't speaking as we normally do. So I said ''Okay honey, tell me what's going on" she then replied "What do you mean" I then explained everything she was doing as listed above and ask why she was doing it. I figured it was something about the engagement the way she was looking at her ring all the time. We argued and talked... and then she brought up something about me cheating on her and ruining the marriage. So I asked "You don't trust me" and she said "No, not anyone" That hurt me and brought me to tears. I never gave her a reason not to trust me, let alone cheat on her! I love her to pieces! Any advice on how we can fix this?
Why does my fiancee seem to not trust me?
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