Boyfriend advice

So i did some diggin and found out my man had commented on some girls tiktok a year ago and put “booty🔥❤️” and another comment that was just this “🥰” ugh i been with him for more than 3 years and tbh our relationship has always been rocky but i just wanna know is it okay for me to be mad at something that happened a year ago? I mean we were together when it happened so