Hello!
I know how you feel because I have the same problem. I know how hard is to trust people, even if you want to trust them so badly, you find yourself not able to do it because the memories come back and they hunt you and you just can't trust them because you're so afraid of suffering again but believe me, you can do it. I know it's difficult and something you should accept is that it's always going to be difficult because no matter what happens the past is always present but it shouldn't be an obstacle. You should live your life always trying to solve your trust issues because it's worthy, there are some people who will always be worth your trust. I don't know that person you talked about but you already trust him, even if it doesn't feel that you don't trust him, you trust him enough. Live your life calmly, one day at a time and try not to think about the future. For me, life is about risks, it's about trying to challenge yourself, trying to overcome your limits so I think you shouldn't give up. Don't feel bad because you can't trust people and don't say you're a bad person because you can't trust people because it's not the true. You're a good person, you just have a problem but you can overcome it, you just have to be strong and hold onto the good things in your life.
Always believe in yourself, you deserve it!
FIGHTING!

Hey dearie.. don't feel that way instead just Talk with your boyfriend about how you are feeling. Although it might seem difficult, the best way to deal with a lack of trust is to address what’s worrying you. :-)