She wants the guy to go for a walk and leave her alone in the house.

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.

She asks if he wants to go on a walk.

He assumes she means "…with me."

She means "…away from me."

She asks if he wants to go on a walk, he agrees (as it's implied that they're going together), she says "see you around" revealing that she actually wanted him to go on a walk by himself and leave her alone.

Here's a third take, she dumped him, he's gone on a walk and not coming back.

The girl is socially awkward and assumes he means to go on a walk later, instead of right now.

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