Driving myself insane

My boyfriend and I️ have been together for about a year. And through the beginning of it all he had a psycho ex who would go out of her to make me feel uncomfortable-if I️ ever saw her. They went out for about a year as well. And unfortunately I️ can’t help to creep up on her stuff and I️ catch myself scrolling to the point I️ hit the timeline of her and my man being together. It makes me cringe , I️ get the overwhelming feeling that he enjoyed it more with her than me. I️ get burning hot red off of the jealousy that she even got him first. I️ just can’t stop going back to her pages and eventually I️ get angry with my boyfriend even though he has no idea why.