How do I trust someone?

It's not easy to trust someone. Try to remind yourself that some people genuinely care and have the best interest for you. Not everyone is out there to hurt you. I understand it's difficult to trust someone, especially if you've been hurt so much. You don't necessarily need to trust several people. You can choose one person to trust a bit. Share a little bit with that one person to test the water and to see if it's safe. If you feel this is going well and you get more comfortable, you can share a bit more. Take it one step at a time. You can start with sharing something small and slowly build it up. Forgiving isn't easy to do. Keep in mind that nobody is perfect and everyone will make mistakes at times. Take your time to forgive. Don't forgive people to make them feel better from their guilt or anything like that, forgive them for yourself. You deserve to move on from things. I hope things get better for you in the future.

You need to think positively, if someone shown you his concern or care then you should give it a try trusting him. If he's just pretending for self-sake, then you need to ignore him. It is the effective way to attract those who are real and truthful. The only that matters, on how would you deal with it if it was wrong and how can you still be positive after being manipulated, At least it makes you stronger eventually and at the end you'll find the right ones.