Awww, I'm really sorry to hear that, Nittie. I always figured you two were gonna last for decades. Anyway, just my humble opinion and I know it's easier said than done, it's probably just best to unfriend, and maybe even block just so you don't stay "involved" at all, by seeing this or that. If you two are still on fairly good terms you could even just tell him that you're going to for that reason, and you're not doing it just to stoke the fire, or anything like that, it's just to make things easier on ya. Time really does heal all wounds, but you have to stop wounding yourself (by constant reminders) before it can start.

I thinks its best to just completely part ways. When you see each others stuff esp if you see them with other people dating or just "hanging out" with the other sex it usually turns into a war to make the other person jealous and that's not healthy for anyone. Best of luck to you!