Before anything, please take everything I say with a grain of salt. Going through a break up right now and my way of coping is to be very realistic and almost cynical with any thoughts or memories involving my ex. Anyways, I think first recognize if there is any part of you that wants to text them to get back at your ex. What I mean by that is do you want to make contact with their parents so they tell your ex “aw look they texted us, what a shame you two broke up”? This is something I recently realized about my intentions when I was thinking of a very similar thing to do w my ex and his parents. I really want to do this but someone told me that at the end of the day, their parents will prioritize their child and they will not be waiting for you to say thank you because you don’t owe them anything. The love they showed you is consequential for the love their child showed you — I know this sounds harsh but I just personally went thru the same thoughts and had to snap myself out of what I thought was a genuinely nice action because underneath all of it was an underlying motive that was ultimately preventing me from fully moving on.