Have you ever Loved someone but were nervous or scared to Love them because you were afraid to be hurt?

I have heard some people say this , basically saying they are afraid to show their true love to someone even though they are head over heels in love with that someone, because they are afraid that someone , will end up hurting them and breaking their heart , if they give them their full heart completely. Have you ever experienced this or did this to someone you loved? Basically you hold walls up to protect yourself if that other person decides they no longer love you the same.
Have you ever Loved someone but were nervous or scared to Love them because you were afraid to be hurt?
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