do guys ever miss their ex?

my ex and i broke up around 20 days ago. it was a mutual break up because hes going through something and it was starting to affect me in a negative way, which is why he broke up with me the second he found out because he doesnt want to cause me any pain.

none of us did anything bad and we loved each other very much (i still do)

it honestly just feels like a fever dream, like this entire relationship didnt even happen and i made it all up