<human>: Can you succinctly summarize the text in 1-3 sentences?

Yesterday, my girlfriend and I were texting each other (long distance relationship for now.) and she asked if she told me about her befriending a security guard in her school. I said no, as she's never told me.

She then sends me a text explaining how she became friends/acquaintances with him, which was cool but the thing that stood out to me was the fact that he called her smile cute. I know it was a mere compliment, but I can be very possessive/overprotective and can jump to conclusions very quickly. I then started to show a little sign of fear towards her, and she caught on pretty quickly. She got pretty pissed off as a result and promptly told me that "He's probably married and he's way older than me, do you really think he'd do that? He'd get arrested." I realized that once she told me, I should have read more closely. She was never the type of person to be comfortable being around guys, nor talk to them due to her social anxiety, but there are those kinds of people who can change things in a snap. She's been pissed off at me ever since that's happened, and I feel like our relationship has been on the edge which is not what I want.
<bot>: My girlfriend befriended a security guard at her school, I got worried due to jumping to conclusions which pissed her off.