NC as people know me on here. Need to just get this down on paper and get some objective opinions.
I'll openly admit I'm a little paranoid and overthink things due to being hurt in the past but I can't decide if this is my 'gut feeling' or my head creating issues that aren't there
Long story short, I was in a LTR but the guy I was with lied a lot, messaged other girls behind my back (probably cheated!) he was never where he said he was and god knows what else. Once I wised up to it and realised I ended things and I've not looked back since
I spent over a year single, coming to terms with being happy by myself and a few months ago decided to get back into dating as I felt ready to meet someone new
After a few months of enjoying the dating scene I met a guy who felt a bit more special and we're now boyfriend and girlfriend
He's kind, caring, funny and thoughtful- on paper he's perfect. He's given me no reason not to trust him other than I've gradually noticed how much he mentions his ex
They were together 7 years (lived together but no kids) and when we first met he said they split around 8 months ago because he felt like they'd drifted apart and wanted different things. He was clear that they remained on good terms but had just gone their separate ways. I took it as a good sign that he wasn't being horrid about her and left it at that.
We've been seeing each other (2/3 times a week) for about 5 months now. We chat on the phone and text a lot in between that. Everything feels easy and reassuring in that respect.
The one thing that I'm finding difficult though is the amount he tells me about all the things he and his ex did together. Not in a sexual way or anything like that but all the places they went together etc. He's constantly showing me pictures of places they went and things they did, not so much of her directly but obviously as he's scrolling through her face pops up. We've been dating 5 months and don't have a single photo together 
We agreed to keep things very slow as I have kids (he doesn't) so we haven't met each other's friends or family at all yet, we're not even friends on social media
There's been a few occasions where he's said he wants to take me to this place or that place and we've had an amazing time but then he'll say something like 'when I came here with x' and my heart sinks a bit
We were casually chatting the other week and I asked if he missed her, he was fairly nonchalant really and just said 'no not at all' but I can't help feeling that I'm living in her shadow
Am I being crazy? Opinions welcome x