Why would a guy suddenly get shy after talking to me for 2 years?

Anonymous
I've been talking to this guy and I really love talking to him and recently he's been acting extremely shy around me. He's never been shy with me before. He's been acting different since July of last year. Now Im old but very inexperienced with guys and their emotions I'm 32 but have never been on a date or had a guy show interest in me I haven't even had sex cause of this problem and I've always felt like it's my looks... So I'm kinda feeling thrown off he got shy after I sent him a whole love confession over text. He's sweet and has always been kind but I'd love to know what would make a guy become shy after a confession? Did I mess up?
Why would a guy suddenly get shy after talking to me for 2 years?
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