Why are women satisfied with being the "other woman"?

This chick spent almost 14 years being a sidechick, basically buying this man. she's 40 now but with 2 adult kids from a previous relationship. He always rejected her for a relationship but wants sex. She was lying to everyone like they were engaged.

this other woman 40 with 4 kids had the same story and couldn’t get this man to pay bills. lied to everyone like they were engaged.

then this girl who 30 with no kids at the time. He been with her for many years. He married her but the side pieces knew but they were totally fine with it. he left them side pieces alone. He bought this girl a house and they staying together.

Why are women satisfied with being the "other woman"?
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