I'm not really one to offer advice on this issue, but I thought you might like to know that I have the same problems with trust and feeling secure in my relationships. I've had this problem with friends as well as with my psuedo-boyfriend. (I can't even call him my boyfriend I'm so insecure!) We've been together for roughly two and a half years, and I sometimes find that talking to him about the feelings I'm having help. It's uncomfortable and feels awkward, but I feel better knowing that he knows whats going through my mind. If you both care about each other and feel relatively comfortable talking to him about these issues then maybe it's worth the time to bring it up. If you dont want to bring up the actual problems youre having, then maybe just mention what you mentioned here might soothe you a little. I hope this helps at least a little!

Take care
Ro