Can someone explain what was the real purpose in dating because in my brain it comes to ulterior motives?

Ok so she apparently dated me based on my personality and didn’t think much of my physical appearance. But then suddenly my personality was boring and wasn’t exciting for her. Can someone make this make sense because processing this in my brain it seems like neither and I served a purpose for ulterior motives and when that was done I was discarded

Can someone explain what was the real purpose in dating because in my brain it comes to ulterior motives?
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