How to deal with a jealous girlfriend?

My girlfriend gets insanely jealous from the smallest things and itís getting out of hand. Yeah I admit that I did cheat on her once, but that happened a long time ago. I donít search women by ID or chat with them online behind her back anymore. While I admit that I might accidently like some random girlís selfie on Instagram or Facebook, it really doesnít mean anything. She doesnít get it though and will completely go off on me when she sees that Iíve liked a girlís photo or commented on it. How do I deal with this?