Gut feeling he's cheating?

I have a strong gut feeling that my husband is cheating on me. All the signs are there! But i dont have any proof at all, all i need is proof. Plus, talking to him doesn't work, he just gets angry, and makes me the problem. Acting like i only want to ruin our marriage. Even when i dont jump to accusations and do it in a respectful manner, he's still the same. If i do the things he does to me, i guarantee he will think im cheating. I just need proof, but I don't know and i can't do anything at all. I dont have money to hire an investigator, i dont have a car, i can't check his phone cause he's secretive and defensive of it when he wasn't before. And its fingerprinted lock. I can't check phone history and such cause he won't let me know the username and password to sign in. I can't check his bank cause he won't let me. Im helpless... what can i do?
Gut feeling he's cheating?
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