Clingy Friend

Someone who you used to be friends with (or still are) but won’t leave you alone and won’t let you hang out with anyone else. They probably have nobody else to hang out with and you can’t dump them because you can’t escape them.

Simon: “Bro, Ryan is such a clingy friend!”
Luca: “I know! He’s so annoying!”
Simon: “I wish I was never friends with him.”