NC for this as it could be outing.
My DD is third year uni. Before she left home to start uni she and I had a really close relationship. Lots of laughter, fun, great times - lots of arguments too but always easily resolved. I'm a single parent and have been for many years. Her father doesn't get involved by his choice
So since uni and her first (and very serious) long distance boyfriend ,things have changed. We still get on but not in any way on the same level as we used to.
She doesn't remember the past as I do and often says that it wasn't as good as I remember and that she's much happier now.
She says our relationship now is much better and it's really close compared to her friends relationships with their parents, but I know she lies to me a lot (maybe she always did, I don't know) and sometimes I feel like I'm being gaslighted and we're talking about different situations, different pasts, different presents 
I know there's nothing I can do to get back what we had, but it really hurts to think that what I thought we had back then wasn't real (perhaps?) and that what we have now is so meh in comparison
Does anyone have any advice? How do I give my head a wobble and stop feeling so sad? 