@Thatgirl8094 okay so there is one thing i always tell people which is " trust is earned " not given. Like when im with someone , i make sure no matter what happens they cant trust me , with their feelings or with the fact that im going to stay faithful.
Even with all of these , sometimes your partner needs a reminder or to assure that you are who you used to be.
I think you both need to straight up talk about the sitiution amd communicate. Tell him how you feel and you need to be able to check his phone to feel better. Also get help from a family therapist which will help alot.