The evidence would suggest that Ye still has hard feelings towards ex-boo Amber Rose. Kanye recently tweeted what would seem to be a shot aimed at Amber and her boyfriend Wiz Khalifa. The tweet was taken down very quickly after appearing, but now before people were able to get screen captures of the tweet.
Kanye could be referring to the recent instances of Wiz getting down on his knees in front of Amber Rose while performing on stage. Check out the tweet.