Someone blames me for making their life hell just because i do not pay ‘more’ attention to them?

Definitely depends who it is and how much attention you pay.

Yes, if she says it's your fault it's your fault

They sound kinda greedy.

Yes.

Hell no

No

That sounds like girl problems

No, that sounds rather needy. One can want more attention from a partner, but ultimately they decide how much it affects their lives.