Hey I need help with my ex

Jeana

I Dated this Boy for 3 months and when we broke up he said that we were not Dating and that I was crazy now when I see him I asked his if he Did say that stuff and he told me no But his friends and Brother and sister tells me Different. What should I believe him or his Friends and family? ( he cheated on me to and lied a About that) one more he wants to get Back to getter should I ?