All I remember is a girl and the singer (boy) bump into each other at the beginning while texting. The guys introduces himself and asks the girl her phone number. She says no and the guy asks for a picture so she says OK. Right after he snaps the pic, the girl leaves saying ``bye _____(his name)``. He starts to sing and goes around the city looking for her. At one point, he is singing on a roof of a tall building and inside is like a huge party. He gets his friends to put up posters of the girl all around the place and at the end of the video, the girl shows up at the party. Can you please help me I have been loking so much for it. Thanks!

Never mind, I found it. It was Conor Maynard! Vegas Girl