How to Stop Being Trusting and Detect Lies?

I had to let go of trying to figure out tbh. If my intuition tells me something is unsafe, I follow it, but otherwise I take people at face value until they give me proof of the contrary.

Trust your gut. Some people the way to tell if they are lying is…..their lips are moving :)

Hey! Im really good at reading situations if you wanna message me about it feel free : )

That's a good question. I think a better question to ask yourself is : Why don't I feel like he's telling the truth, Even if I ask him if he's lying OR why don't I believe he would come clean. The fact you said yourself, is you doubt he'd come clean even if he was lying. So he seems untrustworthy in your own words. This person does not seem to have your best interest at heart if you are always worried he is lying. I think you should ask yourself if you are comfortable wondering for the rest of your life if he's lying, the fact is he should never leave you wondering you should always feel confident he is telling the truth. If he gives you reason to feel uneasy, it is because there is something to feel uneasy about. You may even go as far as convincing yourself that he is being honest even if you strongly feel he is not.

Also, regarding my intuition, I didn't think he was lying at all until I talked to my friends and they said it sounded suspicious. (I was just talking to them lightly, I wasn't even asking them if they thought he was lying).