What do women gain from going into a relationship and not actually being interested?

she wasn’t into the relationship at all communication was constantly a struggle she was more invested in what was on her phone or something else rather then talking this led to a lot of miscommunication and arguments. My thing is why not just say no from the start why even go into the relationship I guess this is one thing that sticks with me. Like why pretend like my perception of actual interest has been destroyed because she was just abusive during the relationship calling me horrible names and physically hitting me

What do women gain from going into a relationship and not actually being interested?
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