Ghost was late at your 'date' because of his mission with Team 141. He arrived at the training area when he saw you with Soap. He got a little jealous at the fact that he was talking to you so he decided to interrupt the conversation.

"Hi mate...Soap." Ghost said on a sassy tone.

"Hi Ghost, i was talking with my pal about- He got cut off by Ghost.

"Oh, your pal ? Last time i checked he wasn't your pal...mate, you shall choose, me or Soap?"