I didn't read all 13 pages, but I can say that OP wants to believe anything, because he fears to lose his girlfriend this much. The fact is, she doesn't see you as her man and spinning plates openly, using lame excuses. Even if she believes it herself, her instincts are very direct. If you were her alpha, she wouldn't dare playing these games with orbiters. And she wouldn't want to. She would want more of YOUR time, not some lame company of yet another beta orbiter.
I'll tell you what happens next because it happened to me, while I was playing all that tough and confident and not caring about "competitors". One day she finally finds someone she can monkey branch to. He doesn't even have to be all that alpha, he just has to be NEW and "good enough" to help her heal after the break up with you. Then VERY SUDDENLY she tells you she needs "a pause", or "some space" or other BS we're all familiar with and go to that guy. If it doesn't work out, she will return to you in a few months, knowing that you're her b!tch and forgive her "mistakes". And you will. You know you will, otherwise you have already ditched that attention wh0re.
Don't force yourself to trust a woman. It's her job to win your trust and the right for exclusivity. You should have drawn this line about dating male "friends" long ago, now you're just a cuck. Don't try to fix this relationship, once you've lost, your rep stays with you. Learn your mistakes and move on. It will hurt, but it's better than wait for the inevitable breakup where she dumps you, 'cause that would hurt much, much more and for much, much longer.
So maybe it’s not all about respect or all this masculine crap. Or boundaries. Maybe I’m just dealing with someone who doesn’t know how to be in a healthy relationship or doesn’t have the emotional capacity as she always tells me.
Yes, it is. You cling to the Blue Pill myth of "the good quality girl", who would love you for who you are and follow the "emotional equity" rule, and build the relationship with you with equal efforts and emotional investment, and appreciate all your sacrifices etc. This is the BS that got you in your situation in the first place. If you don't get rid of these Blue Pill delusions, you will get into the very same situation even with the best girl of your life, the only question would be how quickly (and how painful will the breakup be).