I'm assuming you're a woman, if you're a man and your boyfriend left you, you have 1 option.
1: Gas yourself.
But, if you're a woman and you want to find a man to stick with you till the end? You have 2 options.
1: Become a mormon or some other super-christian
2: Get pregnant AS SOON as possible, and threaten to sue him to death if he leaves.
Those are the options, you fell "in love" with a Chad and expected him to act like a John. That won't happen. You sound like a lazy, self absorbed, ego-maniacal, "treat me like I'm a princess," daddy-issues, basic bitch. Grow a personality, improve yourself, hit the gym, learn some fucking math or some shit, I dunno. Become SOMETHING other than Generic Bitch #372984 that starts out as approachable and interested but slowly loses interest in sex as the time goes by and becomes an NPC. Start providing for yourself and finding out how to provide FOR HIM, that's right, if you are capable of having your shit so together that you'll be able to handle his shit too you'll keep him every time.
Now that generic advice is out of the way, let's get to specific.
>I'm "Naturally" monogamous
This sounds like some new agey hippy bullshit and you need to cut it out right now. You're a human female, women require care during pregnancy, of course you're monogamous. You're not special, and any women you know that like to ride the dick carousel are genetic defects that will die with 17 diseases and 8 kids from 9 different fathers.
>I used personal ads
Fucking trash, nobody uses those anymore. Your best bet is to join a church, search your group of friends to see if any of them have single brother/cousins/friends/etc, or a dating site like E-harmony.
>Have you done something to upset him or "turn him off"?
Don't worry about that, he's gone, and odds are he's not coming back. Move on. If he DOES come back, that's good news **I guess* but don't expect it or worry about it.
>I have a habit of telling everyone literally everything.
Simple rule of thumb, count to 30 in your head before sharing something you wouldn't tell your boss.
>I do say 'non-sense" that comes off as random.
Are you talking "HURGLFALCKASDR WEEE" or "Lol, isn't that so lava lamp xDDDDD"
Because one is a big deal and the other isn't. Either way, previous advice applies.
>I have so many diagnoses that I don't know which disorder it is.
I think this is probably a big problem too. Unless you're seeing shit that isn't there, or experience EXTREME mood swings on a regular basis (I'm talking "Let's go to Disneyland!" to "I'll fucking kill you!" in the matter of hours with no major trigger) then odds are you're fine and the jew pharmecists are just trying to push you some pills so they can steal all your sheckles. I know, I've been there. Literally the only pills that matter are lithium, and Gabapentin, and the Gaba is chump change compared to the lithium
>Okay, if you know he has his own self-agency and his own life, why are you still upset?
>I don't know. it's been so long that I don't remember. I guess I worry I won't be with my true love even though everyone else and even he will.
No, you're worried about what you'll become once you move on. Right now you're in the "dumped girl, feel bad for myself" box, and you don't want to pick yourself up and put yourself in another box that you don't know the label of. You're scared of all the shit you'll have to do once you move on that you'd rather not. You're so used to being a big fish in a little pond that you refuse to go to a bigger pond and grow. But you're not a big fish in a little pond, your a little fish in a minuscule pond and you need to go into the scary new pond and grow into a bigger fish.