PlayStation Privacy

So i have this weird friend not even going to call him that but i don’t always want to play with him, a few months ago i found out that he kept stalking me by checking my online activity, i always appear offline but he checked my last played when i turned everything off he did the same thing the next day thats how i knew, for some reason a couple of weeks ago he started to appear online and turned back the thing when I send him messages on discord he takes a long time to reply and he is a bum he literally does nothing all day BUT everytime i go to check he’s recently played to see if he is ignoring the same minute even seconde he replies instantly back, this guy is genuinely a creep i removed him from friends and blocked on him and don’t really respond to his messages anymore but how could he see that i checked on his profile i searched everywhere and didn’t find anything does anyone have an answer or is this guy just like a good stalker?