To be honest i've seen comments saying that the uke is a piece of shit too but he's not, he's just so fucking unlucky that his crushes become obsessed with him like this it's just normal that some of the seme's past actions rub on him like this, they're all blaming it all on him for falling in love and its just sad for him. If you have a crush on someone isn't normal for you to try and get close to them "you seduced me" well you're the one who took advantage of that love for you. The seme needs to realize that all of this is his fault and that it's normal for the uke to fall out of love for him because he treated him like a piece of trash.
Sand Castle