My ex broke up with me 2 weeks ago cause she said the flame went out, she just messaged me then and said hey hope your uni exams are going well, my dogs want to go for a walk, do you want to walk them with me and we can catch up. I still have feelings for this girl but don't know what to do. Should I message her back? What should I say to her to give me the best chance of getting her back?

I wouldn't answer at all -your busy - she said she doesn't want to be with you - you should act like that until she says otherwise.

This is a test to see if you're a whipped wuss boy and come running every time she asks.

OR - IF you have to only text her back a couple hours later justing stating your busy and nothing more.

You need to be unavailable to this gal - mysterious - make her think about you.

You don't want to go into 'friend zone' - very, very hard to get out of.

Winning a woman back is very difficult - and no contact is the best initial strategy.

she said she doesn't want to be with you - you should act like that until she says otherwise.
This is so true... experienced that myself. There's nothing you can say that will make her change her mind. She will change her mind on her own or she won't at all.

"There's nothing you can say that will make her change her mind." - Yes 100%. I've been there myself. You can't.

You can't convince a woman to like you - it doesn't work that way.

You have to change as well - figure out what you did to drive her away.

I have a feeling to needy-clingy?

You need to improve yourself.

Yeah, laeve it alone for now. You ARE busy. Good luck with your exams! :)