You can have all his social media accounts and his phone open all the time but that doesn't guarantee that he won't cheat on you. Mature relationships require a solid foundation of trust and if you find yourself needing to know what your partner is doing all the time, then you don't fully trust your partner.
Be with someone you can feel comfortable not knowing everything he's doing because that means he's a trustworthy person you can fully believe in.
Mature reltationships require a solid foundation of trust and if you find yourself needing to know what your partner is doing all the time.....you might be insecure and projecting.
Be comfortable with yourself and you won't NEED to know everything he's doing.