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In English, there is a difference between “believe” and “trust” which confuses many people. The word “believe” means that we believe someone’s statement, but the word “trust” means that we believe a person is honest and reliable in general. For example:

Yvonne said she didn’t steal my money, and I believe her. She’s never lied to me before.

I don’t believe the promises that politicians make. They almost always break them after they get elected.

I really trust Peter. He’s always does what he says he’s going to do.

If I were you, I wouldn’t trust Rachel with your boyfriend. Apparently, she has stolen her friends’ boyfriends before.

We can also say “believe in” followed by some kind of spiritual or religious phenomenon such as “God”, “ghosts”, “reincarnation”, etc. However, in these cases, we can’t say “trust in”.

When can sometimes say “trust in” but this just a more formal way to say “trust”.