That doesn't mean it was bad, only that it wasn't long-term.
In fact, since this person is no longer in the picture, mulling over these posts and pictures is only going to make it that much harder for you to get over him or her.
So instead of fixating on the happenings in your ex’s life, shift this time and energy toward improving your own life.
And while you may want to replay every moment with this person in your mind in order to figure out exactly what went wrong, when things changed or how you got to this point, obsessing over every little detail of your broken relationship is only going to cause you pain, distress or even regret.
Instead, you should accept the reality of the breakup situation, make peace with what occurred and place your focus on the future instead of the past.
It doesn't matter in the long run whose fault it is, and avoiding blame spares you both a lot of pain.