I have terrible terrible trust issues 

I’ve been betrayed by many people in my life especially by my family and previous relationships 

 I constantly think people are lying to me
Even when my best friends tell me they love me or enjoy being around me or something. I can’t and refuse to believe that anyone really likes me. It’s very difficult to manage sometimes and really stresses me out internally. It has caused me to split and abandon friendships in the past. I tend to isolate myself completely from people to avoid being hurt. 

I’m in a relationship with someone I love very dearly and I constantly question her all... the ... time. I’m always asking her questions and It’s starting to drive me insane because I feel like I’m being too much but I can’t stop the feeling in my chest when I need reassurance. I don’t ever want to drive her away and I want to feel secure. Even though we have an honest and open communication system, I want to just start asking less and trusting more.  I want her to feel like she doesn’t have to worry about me and that I’m constantly going to accuse her or suspect her of meaningless things.

Does anyone have any experience of coping with these sorts of feelings? 