Yes, there is a subtle difference. To “believe” means that we have confidence that something is true, but to “trust” means that we consider a person or thing to be reliable. Here are some examples: Believe: - She said she didn’t steal my money, and I believe her. She’s never lied to me before. - She said she didn't steal my money, but I don't believe her. She's lied to me before. Trust: - I wouldn't trust her with my money, she's stolen money before. - I trust her with my money, she's never stolen a thing in her life. To further illustrate the difference, you can believe someone, but not trust them, and vice-versa. For example: - Even though she's untrustworthy and has stolen things before, I believe her when she says that she didn't steal my purse. She wasn't even at the party when it was stolen. - Even though I would trust my best friend with my life, sometimes I don't believe the things she says, like when she claimed to have met Elvis.

As a non-native i understand it as "believe in something" and "trust someone", but i saw them both used in both meanings.

If you believe someone you think that what they tell you is true. If you trust someone you think they will do what you want them to do. "Believe in" is more similar to trust than "believe"