Why am I never a guy’s first choice?

Men seem to always see me as a back up plan. I had this one guy beg me for a chance despite me rejecting him multiple times. When I finally gave him a chance, he never wanted to be seen in public with me and told me he only wanted to be friends with benefits, meanwhile he had been actively courting this other woman for a year.
Why am I never a guy’s first choice?
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