Refuses to talk about ex?

my boyfriend won't talk about his ex. I can't say I'm upset about it but I don't know why he says what he does. he will talk about her then stop suddenly and say he doesn't want to talk about it. I'm not too worried about it but id like to know if its a warning sign that he might not be over his past relationship yet. I'm not sure when they broke up exactly but we've been together for 6 months now so I'm not sure if he just doesn't want to talk about her because a lot of girls talk down about guys who talk about their ex or if he still has feelings that come up when he thinks and talks about her but is repressing them.
+1 y
also it was his first real girlfriend and they were together for a while. am I just worrying too much?
Refuses to talk about ex?
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