Dreaming of an old flame😍

Hey ladies so this morning I was dreaming of an old flame of mine his name is Adrian and the only time I thought of him is when he had randomly added me on Facebook one day and we didn't talk he just liked some of my post and I liked some of his.

When we were younger me him, my older sister and his older brother all went out for "a date" and went to the movies and watched a scary movie I think it was one of the Saw movies. Well after that date we didn't see each other much but would talk. We eventually became boyfriend and girlfriend for awhile I can't remember why we broke up but I was so in love with him and was very happy we were officially dating. Well last night I dreamed of him and his wife and his family and he had looked up at me and had the biggest smile on his face we gave each other a loving embrace and caught up a bit me and him eventually got back together (in the dream) and he gave me an unforgettable kiss that made me smile so big I ended up waking up with a smile on my face but it disappeared once I saw he wasn't next to me but my fiancé was and now I can't stop thinking about him I tried looking it up but not much came back can anyone explain this to me?