What does it mean if a guy puts two dots after a word?

So I was texting my ex (I don't want to hear move on so don't even try it) and we were talking about how my email service sucks.

Me: Did you have trouble getting my emails when we were together? (we've been emailing for a while)
Him: No, I don't think I had trouble getting your emails when we were together..

It made me think that he might have thought of our old relationship.

Tell me, am I over thinking it or does it mean something?
Updates
+1 y
Before that it was like this.

Me: Sorry for last week. (I got mad at him for nothing)
Him: You are really confusing
Me:Why?
Him: A lot of your emails are not showing.
(Then starts the part in the question)

He just randomly changed topic.
What does it mean if a guy puts two dots after a word?
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