naff twat
a useless, loudmouthed twerp who loves you until his dumb mates turn him into a naff twat, and then he acts like you're the problem and gives you the worst vibes ever.
He was my bestie until his dumb friends showed up and he forgot about me.
He promised to text me every day, then ignored me for weeks when his mates came around.
He said he'd help me with my project, then laughed at me when his mates showed up.