Embrace your inner Fuckit!
Another strategy: About 20 years ago, abroad (where I was and had been living)- I met a bloke. Nice enough bloke but for some reason I completely fell for him. Bit odd, bit arty, bit disconnected. This was a mistake. My stoical, geddonwivit side said 'Do not engage, Do not engage!' but I kinda did. I went 'out' with him for 9, stupid, but sexually satisfying weeks
. But I am ashamed to admit I began to -ahem- stalk him, just a bit. I sat outside his house in my car on evenings he 'wasn't free'- yes, yes, ' Not free'. oh yes, who is it, then? Hmm
..... He was feeding me, unwittingly, enough rope. Note, he didn't calculate any of this, it was all what I chose to make of it! Anyway, something deep within me said 'Enuff'. Remember I was abroad and away from 'home' etc though had 'A' support network, but not quite enough to really 'help me' without appearing a bit of a tit. Or so I (probably correctly!) felt.
I wandered into town of a Sunday. (He was 'busy'- in fact, gone out with a gang of old mates, horse-riding, I later discovered- I asked 'Um, didn't you think I might like to come, to which he said, genuinely nonplussed 'Why?'...) Anyway, I wandered through the 'self-help' section of a bookshop. I idly glanced at then picked up a book about 'obsessive 'love'. Complete nonsense, thought I, as I skimmed it, and skimmed it- til I was on page 35. Then I saw that it was talking to me. So I bought it.
I read the entire thing, rejecting that which did not apply, BUT I learned a great technique, The Brick Wall.
Idle thought... 'Wonder what Gary's doing now? I wonder if he'll call?'
'Wonder why he hasn't called, Surely he's not with someone else?'
< Fantastic! 10 more red bricks! I shall lay them neatly! First I shall dig some foundations as my wall needs to be strong. Great mortar! Nice effect!>
Gary, Gary, Gary
'But surely he...?,'
.. Wonder what my flat mates are doing?..
Aha.
Til my first 'Gary' thought was suddenly blocked by my wall.
Stupidly simple, very effective.
And incidentally, 2 weeks later met the bloke who is now the DH of 15 years....
I am really sorry if this all sounds stupidly simplistic- but I tell you what, it worked for me! I recognised that my Gary obsession was in no way, shape or form benefiting me, so I stopped having the obsession, via The Brick Wall.
Again, good luck!