Old friend of girlfriend messaged her at 11.30pm at night, should I be concerned?

Anonymous
Wondering if I should be concerned or not with an old friend of my girlfriend which decided to message at 11.30pm at night...

I'll call my girlfriend Alice and the guys girlfriend Emma

So bit of a back story, they were very close when they were younger. He ended up getting himself a girlfriend, short while later he told Alice that Emma doesn't want them really hanging out as it's causing issues because her friend seen them holding hands together and hugging. He then said he told Emma it wasn't true but she was still feeling uncomfortable and decided to cut off Alice entirely. He hadn't spoken to Alice for 2 years after that, as soon as he broke up with his girlfriend the first person her messaged was Alice, asking for advice and speaking to her non stop about his mental health problems. Making her feel bad for him so she would message him a ton. Another girlfriend came along and felt uncomfortable with him and Alice again... and the repeat happened.

Fast forward I've been with my girlfriend for a year now, she told me this back story and I felt a bit uncomfortable... its a bit weird for 2 gfs to feel uncomfortable with just them speaking unless he was a bit close or had some kind of feelings? Either that or maybe he doesn't and they were just 2 insecure gfs?

In the whole time I have known her, he hasn't messaged once. Then last night at out the blue, after being single a short while. he messaged at 11.30pm just saying hey, maybe it's me but late at night is a bit weird... After 11pm he is either a night owl, suddenly started thinking about her or was lonely... she messaged back to day as her main concern was maybe he had another mental health issue. His reply was just. Yeah I'm good x how are you? She said yeah good thanks and it ended there.

The short convo and message late at night almost midnight, I just feel something is off about it? Am I over thinking? What is your take on it?
Old friend of girlfriend messaged her at 11.30pm at night, should I be concerned?
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