Dreams and their meaning

I don't know how much i believe in all this honestly but i have seen patterms in my dreams. I remember for a few months last year i kept having the same recurrent dream, just slightly different from eachother but leaving me with a familiar but restless feeling everytime. 

I have started keeping notes of some of my dreams since then, but now i rarely even dream. After a good few months i finally dreamt something last week. I don't clearly remember it but i remember feeling nostalgia and this feeling of 'if only' when i think about it right now. 

I have only once dreamt of my ex and it was a a little while after i had thought i moved on. It was nothing grand or special, just us hanging out with his siter who i have never met just heard about. There was this weird understanding between me and him, everything that happened between us in real life still happened int he dream too but we had a mature understanding of it, choosing not to hold it agaisnt eachother. We were just enjoying the moment, there was no romantic connotation to it, just the comfort we shared when we dated. Nothing after that. 

I have dreamt about many people i barely knoe but it hasn't happened in the last 2-3 months. i have had close to no dreams in this time, at least non i remember. I wonder what this all means, if anything at all. 

any thoughts? i'd also love to hear about other people that have felt or experienced something like this