How bad is it to marry someone for your benefit without them knowing it, and leaving them after 3-4 years? Is it easy to get over a divorce?

I'm a 22 years old guy who is seeing someone who's 27 years old.. And I wanna marry that girl so that I can concentrate on the things that I wanna aquire, in return I'll help her with everything when it comes to sex, money, security. She doesn't wanna have kids and neither do I for next 5 years so is it okay if I go ahead and marry her and leave her after 5 years? How long would it take her to get over me?
How bad is it to marry someone for your benefit without them knowing it, and leaving them after 3-4 years? Is it easy to get over a divorce?
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