<human>: Otherwise, we're in a good place in our relationship. It doesn't happen often (I count 4 times in the last year) but it hurts every time. 

Usually it's:

* Me: talking about some concert/restaurant
* Him: "Oh, like that one time we went to concert X/ talked about Y"
* Me: "... we never went to concert X or talked about Y..."
* Him: pause... "I'm sorry, I could've sworn we did"

I know he was thinking about something he did with his ex because I've seen old pictures (yes, I snooped in the past and have overcome that).

I can't help but feel sometimes that he sees our relationship as a continuation from his past 4 yr relationship (he was still in love when she suddenly broke it off, and more than 1 year passed before we started dating) which makes me feel less valued. I don't want to just be a replacement for his ex.

We've previously talked about my insecurities with his ex and I believe him when he says he's long over her. They haven't been in contact for over 2.5 years, but for whatever reason I'm still bothered when he confuses things... I know a lot of things happen in the span of 7 years so am I overreacting? Or is this a bad sign that he isn't completely over her? I haven't had a previous long-term relationship so this is new territory. Any advice would be appreciated.

Can you condense the text into three sentences or less?
<bot>: Rarely, boyfriend mentions something he thinks we did together, forgetting it was something he did with his ex. Am I, a relationship newbie, being paranoid and insecure?