Why is it hard for me to accept that someone kissed my girlfriend before she was with me?

Anonymous
My girlfriend was kissed by a guy before she was with me, and although she rejected the kiss, his lips still touched hers for a second. If I have kissed several girls before, why am I feeling uncomnfortable that I was not my girlfriend's first kiss?
Why is it hard for me to accept that someone kissed my girlfriend before she was with me?
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