You'll need a lot more than just a few arguments to convince them they need you. They learned the hard way how it is to live without love.
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My ex In a nutshell. We were a perfect couple in most aspects but before me he had been single for a looonng time that I don't think he knew how to accept that someone loved him the way I did but he was also incredibly selfish as he hadn't needed to think of anyone but himself for a while. Sad times.