The situation in the picture suggests the guy is romantically interested in the girl. Based on body language, the girl appears less interested. Based on this perception, somebody added the text in the post, which is written to sound like the girl is inviting the guy to go on a walk together. When the guy readily agrees to the arrangement, she surprisingly indicates that she is not actually going on the walk, but she was trying to find a way to ask him to leave without sounding impolite.