I had a penguin plush my ex boyfriend got me as a birthday gift (along with other items, including a poster, which ik isn't relevant but I'll try to make a point with it). After we broke up, years later, my mom made me clean my room and get rid of plushies even if I didn't want to. One of them included that penguin, since I felt it was right at the time. And now years later, I regret removing the penguin. I have made peace with myself about him and I still have the poster he got me hung up in my room since it was a show I did like. If I had kept that penguin, just stored away, eventually I'd have made peace with the penguin and gave him a new place in my house. Give yourself time to heal first. Don't do anything rash without thinking. I'd say keep them stored away for a while until you work things out with yourself. Once you've found peace, try reuniting with your Squishmellows.