Read: Why do guys pull away? You have to understand that Geminis and air signs in general are rational beings and not that emotionally dependent on people.
So I ignored then one night I was going to a dinner party and thought of him and it made me smile.
But Gemini is a mutable sign.
Which is, admittedly, not the easiest thing to do with a smooth-talking Gemini man.
This small things will definitely works for your Gemini ex to feel happy and start the relationship with you again.
But even if you were expecting it, when he says he changed his mind, it can be confusing.