I'll see/we'll see
Saying 'I'll see/we'll see' is like telling your friend to go to hell. It’s the worst kind of ghosting. If you hear this more than three times, you should probably start ignoring them.
'I'll see', said when you asked if they wanted to eat pizza
'We'll see', said when you asked if they wanted to go to the movies
'I'll see', said when you asked if they wanted to come to your house