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I feel you OP. GF of 2 years left me last month cuz she couldnt trust me over the smallest thing. I gave her everything and its like she just threw it away in the heat of the moment.
Try to keep yourself distracted by improving yourself. If she's the one who left, then she chose to miss out on what you could be. At the end of the day, you're all you've got. Wish you the best man.