<human>: Can you provide a brief rundown of the text in within 3 sentences?

Me 21m, her 21f, been together about 8 months now.

She was with her ex boyfriend for 2 years, and lived with him for 1.5 years. She always talks about how stupid/psycho he was so she clearly doesn't like him. He kept texting her until she called him to stop, and they ended up getting in a huge argument (on the phone).

Anyway since my gf always looks through my messages I decided to look through hers and she texted her Ex. And this was on her new phone so she went ahead and added him to her contacts. 

There was nothing flirty in the messages, more so just catching up and saying hello. 

Should I be concerned? She always talks about how much she hates him so why would she bother texting him on her new phone??
<bot>: Girlfriend got new phone, texted her ex boyfriend who she always says she hates. Nothing flirty at all in the texts. Should I be concerned?