Is it possible to get my girlfriend feelings back?

I neglected her and hurt her for a few months to the point she had enough.. so she fell for someguy..
She said lets remain friends and i disagreed so i disappeared for a weak..
She then messaged me saying im with you if you can make my feelings for you come back.. she wants me to try and gave me all the times i hurt her and wants me to try and return her feelings for me.. i agreed to this because i read a lot of stories of people who lost feelings and it came back or exes who came back..

What do you think.. can it happen?
Is it possible to get my girlfriend feelings back?
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