I have questions pls answer

Why do my ex lurk on my social media accounts? 
Why is her gf lurking on my social media accounts?
Why her gf have her friends trying to be my friend on one account?
Why my ex post pictures of her and her new gf like I care? 
Pls don't say I care because I don't it just makes me mad that I can never get away from the drama and yes I know I'm letting them push my buttons and I'm entertaining it.