When an ex still has pictures of y'all still on fb does that mean they plan on getting back together with u or is it for memories ?

Memories or they can't be bothered to trawl through and delete them.  

You'd have to ask them. We can't read minds.

Not necessarily, I just find it weird. My ex did this, even while dating other people long enough to make it facebook official and put them in a profile picture, but still kept us as their cover photo and several others that you could see featured in the "most liked" or "most commented". My ex has never reached out to get back together. I deleted everything, but that's my way of moving on

they forgot and don't care. doesn't mean much. don't look too far into it.