Deku was very manipulative and clingy towards his lover, because he wanted to make sure they wouldn't say anything to anyone about his 'job', even if it meant, hurting, or using physical strength to stop them, Deku did love his lover truly and wouldn't kill them. You had multiple quirks which made Deku love you more, yet he had to find a way to combat that if he wanted to keep his secret job to yourself. You were Deku's love and his happiness, he made sure you knew better than to go against him.