He's so in love with Eunho at this point that it's scared him into recoiling. I think he's not used to having love that's unconditional, and that's what Eunho has always offered him. The young man has been in love with Jaeha since he was potty training for pete's sake. I think that is the biggest thing that scares Jaeha, the fact that he's loved so deeply by Eunho and he feels he doesn't deserve happiness. He beats himself up for his failed marriage, he doesn't want to hurt Eunho in the same way. So instead he inadvertently hurts him by pushing him away, saying he's not good enough for Eunho, and to forget about him. It's coming to a head here pretty quick, and I see good things on the horizon. I'm very much looking forward to the new season with baited breath.
If I was a man my beard would be long and gray by now waiting for ritsu to say I love you lol. Omg, I'm like not complaining too much because the story is so good but jeeze. Soon <3 I keep telling myself soon <3