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Dazai didnt know what was so great about love.
Really he didnt understand what love was he had tried to observe people inlove, many times but it was just useless in the end he couldnt understand.
How you could love someone knowing they can hurt you, showing your weaknesses to others was not the port mafia way,it would most definitely end with him painfully dying either way so there wasnt a point in looking for a reason to love,showing his deepest most vulnerable self to someone wasnt really on his bucket list anyway.
It made him sick to his stomach that someone like him could love let alone be loved.
He found that to be something god didnt add onto his ultimate plan.
That was untill one fateful dreaded day when he was 15.
A rather annoying red head (really he was annoying not at all charming) had shown so much human emotion in one day than dazai had in his whole life and that fateful day dazai realised that the reason people fall inlove is because it excites them.
It shows them that the world isnt all dull and grey (or maybe that's just how dazai saw the it before red hair and blue was the only thing he wanted to see).
So no, dazai didnt understand what love was but he wanted to find out from one person and one person only.