Hello. I always deal with everything, whether it's a painful thing or a happy thing, all of which I am grateful for and consider it happiness, because happiness is something we create within ourselves, so I don't expect that someone to make me happy, because it's too hard to find, if that's the case maybe I'll delay my happiness and waste time just looking for someone who makes me happy...
So in my opinion, happiness is eternal if we ourselves are grateful for all the things we go through and around our environment.
Thank you