It's because he never communicates about what's the deal with his family. Yamato only knows about his father. Not about the whole situation in his house. Meanwhile Hozumi knows everything about Yamato background because Yamato has his uncle who very much cares about his happiness and wants his partner to understand his pain too. Hozumi didn't have anyone like that in his life.
Yes... I know and understand that... I just want the uke to be truly happy, open up and come in terms with his family as well. Like moving on or letting go or becoming stronger. But he still can't share everything without hesitating to the seme just shows how he can't still truly open up to Yamato cause he's kinda..., yk far away from the uke... How do I put it. It's like you love and trust someone yet you still can't share or open up it cause of the insecurities or ya scared or something similar to it. The Uke unable to open up and tell the seme everything is also because it's not easy for the Uke to do so. He is probably insecure or isn't very confident & he's also prettay heartbroken by his own family to the point he isn't truly happy yet.
I feel like the best way for things to unfold is for Yamato finding out about it. I don't think Hozumi will ever be in a position where he will be able to confront it without a push. It's really complicated. What even breaks my heart rereading this is the chapter telling about how Hozumi saw his mother walk away. Like he was about to run for her until the end. And then he saw his mother smiling with the new man. He stopped and understood that his mother was happy and in a better place. Again when he saw his mother at school, she was happy. It's like he wants to be mad at her for abandoning him. But he couldn't do it because his mother is happy. Being with Yamato probably made him understand it even more.
Ikr!! It's sad to see him so hurt. Some people are saying that the uke is a crybaby and keeps on crying etc etc... But I mean if I were the uke I'd really have so many resentment or anger issues. As for our Uke he is just that way, maybe it's just his coping mechanism or something. I mean... He doesn't get mad, angry or isn't aggressive. He just bottles everything up but cries only when he is with the seme.
We need to protect our UKE. Tbh I feel like even the seme doesn't really understand him right now... Which is making me feel more sad for the Uke even tho he is happy to be with him. Sighs* I hope it'll get better... ヽ(`Д´)ﾉ