<human>: Background: me and my SO have been dating for a little over 3 years now, the relationship has been great other than some of her anxiety/self-diagnosed depression. Me and her started dating very shortly after she broke up with her ex, and before her ex she had been with upwards of 8 people..but that's early high school/end of middle school stuff, doesn't mean much to me just thought I'd add. 

So, I am away at a university 3 hours from her. Her ex, whom she messaged, is going to the same school she goes to but they don't see each other. She messaged him out of nowhere asking him how we was and what he was up to. She had always always always claimed to hate him but just recently has told me she does not hate him and has no negative feelings towards him.

She told me this two two days after it happened and I was obviously upset. She initially argued that there was nothing wrong with it and it was an innocent conversation but still, the whole thing sounded sketchy and inconsiderate to me. But, she now claims she did it because she was trying to make me jealous (why, I do not know). I have always been a very loving and supportive boyfriend and she has always said I make her happy and do everything perfectly for her. There have also been multiple times in the past when she didn't not feel 'good enough' for me and almost ended things.

Could you distill the essence of the text into 1-3 sentences?
<bot>: So, my question is, am i right be bothered by this conversation she had with her ex? Should I suspect anything more to be going on? Or am I overthinking and overreacting? Thanks!