That sounds overly possessive and literally unhealthy
it's the stupidest, weirdest behavior of an overly possessive, jealous person who will accuse you because they are afraid that you are the same way they are: prone to cheating. Without fail, overly jealous people are bound to be cheating on you or open to the idea of cheating on you. Don't get involved with them.
They're also like the thought police. They think that they should be the only person in your thoughts, too, as if you aren't entitled to privacy within your own mind.
LIE to anyone who demands to know what and who you're thinking about at all times.
lol my first crush was a guy named Derek. I can see it.
How is watching porn cheating on someone?