What would I do? Its simple actually...

RUN

Your bf isn't merely insecure, he's controlling, he's actually very creepy keeping tabs on you 24/7. In case you haven't noticed, its UNHEALTHY.

I had a bf like that once, he was way more subtle about stalking me though. We broke up because, to my (then) naive surprize, control is a hallmark red flag of abuse. The asswipe beat me to a pulp after having been with him for over 4 years, bending over backward to prove myself trustworthy...

He'll never trust you, he may not even beat you up, he may just want to own you, to possess you, but believe me when I say he'll never trust you.

You can give up all your basic human rights and not just your right to privacy, and he will still call you incessantly and give you the 3rd degree everytime you've left his side.

He will still dictate your life, you social activities, your wardrobe, where you live etc... He may not even tell you to make these decisions, but he already has surefire ways of making you choose what he prefers, because you prefer to avoid conflict. You're been manipulated, playing right into his hands, isolating you from friends and family, living where he prefers etc...

Its been 3 years... The writing is on the wall my dear.

Either accept that this is the nature of your relationship, where you are considered this man's property and he may or may not get physically abusive in future, or get out.