I commend you for getting help for the lying, but you need time to learn more about yourself alone if you want any chance of being someone who can be happily married to anyone. It’s one thing for sexual intimacy to wane, or to have squabbles. But doesn’t it strike you as strange that your letter contains barely a single positive thing about your relationship? (You love her. I love my immersion blender, but we’re not compatible as married partners.)
Let them know you’re bummed that it’s always up to you to organize things, and put your money where your mouth is: Decide which relationships are worth the extra effort, and show tough love to the ones that aren’t. So, for example, if the relatives don’t step up, you suck it up but let some of the other friendships die. And when you seek new friendships, mention casually from the outset your past experiences, and use their empathy and motivation and effort – or lack thereof – as a screening tool.