To explain that - someone else in your position might have brushed it off, felt even worse or couldn't have cared less.Your reaction will to some degree depend on your specific circumstances of course, including your relationship history.
These are all normal feelings under the circumstances!
In the gym example, someone says something to you about your weight.
You get excited and you work out regularly for a short time. Next thing you know, it’s a holiday and you feel lonely. Your parents or family members say something to you about not being married or not having a boyfriend.
In the current study, we investigated whether people with greater social anxiety respond defensively when the threat of being rejected by one׳s romantic partner becomes salient.
Confronted with possible rejection, we hypothesized that people with greater social anxiety would devalue their partners to minimize the impact of the rejection.