I think this change would better capture the bitter sweet tone that I think you're going for!
But I also want to say what is there now is not mean, nor are you a jerk for having made it. Relationships are complicated, and a person saying something nice one day wouldn't erase a week or more of less pleasant interactions. My best guess for the down voting was that it was just more negative than the redditers could enjoy. I think the above change would help hit the bittersweet note I think you're aiming for, and might be better received on reddit as a result. =)