Why is my boyfriend texting his ex?

Anonymous
my boyfriend and I have been living happily together for a few years now, with plans to spend our lives together (we talk about it regularly). its a great relationship and I am happy being with him. last week, our sex life slowed to 2 times/week (we are normally everyday ish) and my boyfriend said he just hasn't been in the mood as much.

this week it is back to normal again, but something was nagging at my mind. I looked at his messages and saw that during our "off" week he had been texting his ex-girlfriend who he hadn't talked to since prior to us meeting. they dated for 2 years and were serious, but also very young.

the texts were mainly just catching up and saying hello and then they just stopped. she kept texting, but he did not. they did both say "i miss you!" but it did not come off in a romantic way, from my impression. I only looked that once so I assume they have not resumed chatting and our relationship is back to the way it was.

my question is... is this just harmless catching up? or should I be concerned about the timing of our "off" week with their catch-up texts?

PLEASE, do not give me advice on whether or not it is right to read his texts. I already feel guilty enough and will never do it again. the man is entitled to privacy and I know this.
Why is my boyfriend texting his ex?
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