A girl you intend to fuck texts you something like "hey" or "whats up" do you ignore it, open her message and say nothing?

Maybe it's cause I'm in high school and I see the girls every day but I find it's weird not to reply at all. Depending on what it is I'll usually reply when I'm not busy, when I'm done my work and finished at the gym so I might not get back to her for hours till I'm in bed or something, but I don't see a reason to not reply at all?

Last night a girl I'm gaming sent me a snap of her and her friend in the bath together in bikinis captioned "this could be us but you playin" - something like that I just see as validation/attention seeking and I don't reply. But messages like "hey, blah blah blah" I'll usually reply to, when I've got nothing else going on, so it's usually only at night.

Thoughts?