What does it mean if a woman sees your messages but doesn't always reply?

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Current Events » What does it mean if a woman sees your messages but doesn't always reply?
I'm messaging an ex gf on Instagram, they reply sometimes and always see the messages not long after but don't always reply. Surely if she wasn't interested at all she'd not even bother reading them?
babynames.com
https://i.imgur.com/TGkNCva.gif https://i.imgur.com/8mWCvA4.gif
  1. don't message exes
  2. do not give attention or thought to girls that leave you on read
http://i.imgur.com/A0TAfek.png
She probably has other commitments. Be relieved. It means she's not clingy.
--I understand your opinion. I just don't care about it. ~Jedah--
bruh why do people make topics they're just going to get absolutely roasted for?
(He/Him)
I write Naruto Fanfiction. But I am definitely not a furry.
She's texting her boyfriend. She ain't got time for your shenanigans
Current Events » What does it mean if a woman sees your messages but doesn't always reply?