I think he is doing the right thing. He need to clear everything from the start.

Oh honey he's not cleaning anything up. Uk he's gonna make him meet up with the sister then like get away from him as like" i have nothing to do with u anymore " so the uke realizes his love and starts missing him then he confesses and start dating
It's all calculated moves and he's being manipulative

Or the Seme is getting ready to actually kill himself. So he’s cleaning up everything before he leaves everything behind.

But the authors semes don't work like that idk you made me worry nowლ(´ڡ`ლ)