You know what, FU** ALL OF YOU. Nobody has empathy for the Seme, and that's so heartbreaking.
How can you guys be so dense and not think about the hurt of being rejected to the point you're numb / given up on showing or giving affection/emotion? That's literally what happened to the Seme. He's so hurt to his past feelings and experience, that the most he can do to portray his care is try to do his best to care for his partner. Yes, he has some flaws and issues he has to work through, but he's not an ass****, toxic uncaring guy. He clearly does care for him, but there's some past trauma that blocks him from persuing or fighting after his lovers. Yes it's fuc*** up, but he's no where near as bad as you guys are painting him to be.
His advice also seriously helped out too. He wasn't wrong for giving advice, especially when it was asked of him. He's literally right. Her method was wrong, which is why the Uke had felt like such a burden to his sister.