Is it ok to date a girl short term to sleep with her while dating other girls to find a long term relationship?

I went on a date with a girl and found out she’s working here as an au pair. She’s a great girl, but since her contract is only for a year, and she’ll be gone after a year, I don’t see a long term relationship possible for us. However, she’s quite attractive so I want to continue taking her out to sleep with her, while I keep looking for a long term partner. Is that an asshole move or ok? I believe she is looking for a relationship.

No problem with that
That’s an asshole move
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Is it ok to date a girl short term to sleep with her while dating other girls to find a long term relationship?
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