Did something stupid

So my ex and his new girlfriend met on instagram, and after I found out that they were cheating, then I blocked them both. Well today I was curious and I checked hers and I seen a post for him with his initial, which I seen before and I was prepared for, but then I checked his and I seen that he put a love post, and had her initial on it, and it just made my heart race and I just burst into tears again, I thought I was over it, why do I do such stupid things 😭