I DO NOT TRUST MY BF

Girls I really need your help to see if I am wrong about this situation. I do not trust my bf because of past situations with him and other females. But, I talked to him and told him that I didn’t trust him and in order for him to gain my trust again, I would need to know his pw’s to his phone and stuff. He will give me one password to unlock the phone and when we argue, he changes the password. He says that I don’t need the password and I should just trust him. But how can you trust someone you don’t trust?! And I’ve made this clear. He says he wants to be together and work on our relationship. I have explained several times that the passwords would help me to start trusting him again. He acts like he hears me and understands, until we argue and it starts ALLLLLL over again.

Am I wrong for feeling this way? Because I am so tired of the back and forth.