I also have never gotten a handle on issues around trust. Several times it seemed I was close to breaking through, and almost inevitably something happened that destroyed my ability to trust.
This has caused me to feel guilty, but I finally discovered that

this lack of trust didn't indicate some grand failure on my part. Yes, I'd like to find ways to trust, but there's also an acceptance level that I've reached, a kind of compromise with myself; not to torment myself with guilt feelings for something not truly a fault, but a result of circumstances I couldn't control.
The worst of the no-trust issue, then, comes when I can't trust myself. I think that's essential--that no matter how steep one's level of mistrust, adding guilt on top of it makes it worse. I also tended to play out the people pleaser game, and got badly burned by doing so, even when I had clear signs not to trust certain people. Now I'm more aware of those intuitive signs.
So I guess the only real solution for me has been to plod along with my overall program, including therapy, of attempting to still find healing in my approach to this, starting with the no self-guilt 'rule'. I think that's along the lines of healing, though not necessarily curing. Living the best I can, but accepting that it's hard for me to trust. As a goal total trust might remain elusive, but living the best I can and building my self-trust seems the direction I'd like to travel. I just wish it was easier.