Ok me and my ex broke up about 6 months ago and we still talk and I still love him. Today is his birthday and I have no idea what to say to him. Him and his girlfriend just broke up today (messed up for doing that on his birthday). I still love him but I don't want him back. Please help me.

Help you... with what?
Is he in love with you and seeing him would hurt him? You aren't giving us much to go on.
Tell him you would be glad to see him today, if he's not suffering over you still, I guess.