Is he lurking or stalking my Instagram?

Basically he is a close friend of mine and I have posted a photo 5 days ago on my account and have interacted with him yesterday.. however today I got a notification that he liked the picture I posted from 5 days ago.. and he has around 200 followers.. could he be stalking me or it appeared on his timeline? Although 5 days ago seems weird so can someone give me an input?
Is he lurking or stalking my Instagram?
Post Opinion