I don't have a Facebook, but I can still relate to feeling stuck in the past. There's some things I really haven't "gotten over," regardless of people telling me to move on from different things. Depression makes me feel even more stuck, and as if I am on a merry-go-round.

I wish there was an exact solution. As far as the above suggestion regarding de-activating that feature on Facebook, that sounds like a really good idea. Now, I am especially glad that I do not have a Facebook to be honest, because that sounds as if it would be very unhealthy for me or anyone with similar problems regarding this issue. Knowing your triggers and doing anything you can to avoid them or at least distract yourself from them could help. Coming up with a new routine might be necessary in some cases. This might help take your attention away from looking at past things that trigger. Watching new things, listening to new music, exploring new hobbies...this can be easier said than done, but the more you fill your time with new things, the more it might shift your focus away from the past.

Cognitive Behavioral Therapy might be helpful to you as far as turning your attention away from unhealthy habits related to staying "stuck in the past" and can help a person develop healthier patterns. There are even handouts online. I wish I could be of more help....I know it's hard.