You mentioned Facebook. I don't know if you are friends with him, or allow his status updates appear on your page, but unfriending him or blocking the posts would imo, be a good start. Although I didn't want to, I recently did this due to being in a similar situation with a good friend. Not having all the visuals/info may help you be able to focus on yourself, and not what he is up to.

Hope you can move on, and feel better. We're all here for you