what should i do?

ok my ex-boyfriend broke up with me about 3 weeks ago. And about a week ago we were flirting and laughing and holding hands and i asked him if he regreted breaking up with me and he said yes. But the tuesday after that when i say him he didn't remember that and he made me feel like i didn't even exist. And then on saturday his cousin my friend said she was going to set us up agian and when she went over to talk to him to see if he would go out with me again he said he was only being friendly. WHAT SHOULD I DO?