Mchn first thing you must understand is that life is a continuous journey beset with problems. As long as you live in this world, problems and troubles will always be a part and parcel of the human experience. so do the fear, worry, and suffering. You are now worrying since you lost your loved one. But what you should realize is that departure or separation from pleasant experiences and those you love are unavoidable. This can happen at any time. Because only certainty in this uncertain world is things must come to an end. Ask anyone or look at this thread also see how many friends of yours had been facing that unpleasant situation. so the very first thing is to accept its inevitability. respect for her decision. she can make whatever decisions in her life. you don't have any authority to sabotage her decisions. Since there is no law that one's love for another must be reciprocated. In your situation mchn it is best to wish her all the happiness for the future well-being and move forward without causing any hindrance to your personality or make a nuisance of yourselves. As in any relationship, there is always the possibility of breaking up. In conclusion, what I want you to realize is that Attachment and detachment are the eternal law of the universe so obey them.
Okay okay no more spititulity talk

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Now, what can you do right now? Crying like a child. Fuckoff men. Invest this time in yourself. do what you love to do which you always wanted to do. This is your fucking life men. Why are you crying for someone who stabbed your back? Stand up it's over. no one comes to rescue you unless yourself. Stop weeping. take your ass out. She cant make you happy it's up to you to do it bugger.
Finally. Kudos to you bro! you have just saved yourself years of being with the wrong person, go celebrate