I mean like.. WTF!!!! AFTER ALL THAT YOURE JUST GONNA SAY THAT YUJIN JS BETTER WITH SOMEON...

some ukes go through the "am I not enough?" phase. However, what we are looking at is a branch out of it and is usually refereed to as the "You need someone else to be happy" phase. It can be a result of the following:
-uke thinks seme wants child he can't get from said uke
-anxiety
or in this case
-genuinely thinks they aren't enough/seme wants someone else
It is a common phase among ukes and most experience one or more of them, though usually at the same time. While some don't go through these specifically they are some of the most common phases out there.
I would think this particular uke just needs some explaining that he is indeed enough. The words they never got before, and therefore might still deny it momentarily, though he should recover from the phase after he realizes that he is enough.

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