Before your eyes the person you thought had the same plans for the future as you did, suddenly does a "rules" switch-a-rue, but maybe you can catch it before it goes that far.
A Selfish Dater is someone who wants to be in a relationship as long as
the relationship revolves around them.
When you met this person, they probably stated that they were finally ready to find the “one”, settle down, get married and have children. Since you were also on this same wanting-to-settle-down-path, hearing this was music to your ears...