Once someone adds you on Facebook you have a designated hour to spend investigating the Facebook profile an additional 10mins (because he definitely won't invest more time in looking at your profile) checking yours to make sure it's fine without seeming creepy or desperate (to yourself ofc, because no one else will ever know). After that...
Don't look at his profile again.
Don't show it to your friends.
and even more obvious... Don't try to compare your profile with her's.
Don't privately freak out and burn all bridges every time he writes something that seems cold or takes longer replying to a text... now this I put here, just because I think it should be mentioned. Even though, who am I kidding? There will be more "fuck him!!!" 's and "this is it!" 's and so on.
If you want to boost your image of what you want from someone listen to a Мачете playlist on YouTube and decide that you're not into this whole uncertain thing and that you deserve a lot more attention and just generally are too good for this. You're a queen. Is all.
but pleeeease, pleeeease, DON'T remember his ex and feel self-conscious.