I still regularly log in to my ex's social media.
Why would you spy on him?
I miss him a lot and i go to his social media to look at the pictures that we both took together.
The worst thing you can do after breaking up with someone is acting like the break-up never happened. The time you spend on his social media is time you could spend better elsewhere.
I think I just miss him and I am not doing so bad after all.
Well it isn't healthy to keep doing this. You need to move on and if you feel unable to you can talk to a therapist.