It's completely logical that you don't put trust in your friends after what happened to you. It's only a way to defend yourself from going through it again. Honestly, I don't think there is any real solution other than being picky. You don't have to be friends with everyone, you need to stay back from people who dont seem right to you. Regarding your close friends, I think you'd have to trust them, take the risk, dive in... It's very scary, I understand, but not trusting in them might drive them away which will be very bad aswell. Take your time though, I think naturaly as time will go by, you'll start to trust them more. This is just my little piece of advice supported by my limited 17 years of experience as a human being I am furtunate enough to have 4 best friends who I completely trust and whom I've been friends with since elementary school. Hope things will get better for you!