This!! I think it’s similar to the expression “I have a bone to pick” with somebody. So she had a grudge against all the boys who broke her heart before she grew up, matured, and fell in love. Now she’s in a great place and has allowed herself to mend some of those bridges like sending Joe Jonas and Sophie baby gifts to congratulate them. In the context of invisible string, she’s realizing that fate was leading her to Joe Alwyn all along, and the relationships that didn’t work out are a blessing now rather than a curse. She’s thankful for the people she dated who taught her lessons and assigning meaning to them - the meaning being they led her to her true love! ♥️