Of course you do, he killed the most likeable character in the first couple of episodes.
I wouldn’t say most likeable. I can’t rank my liking of one character over another in FMA because there are so many loveable ones. Hughes was certainly easy to fall in love with though, they did kill him off right when he had enough character development for everyone to love him, and that’s what made his death so impactful. And yes, it made Envy my least favorite character for the rest of the show