How do i stop thinking about her?

SInce you're both not kids it's ultimatum time for BOTH of you. You obviously want her back and she probably wants that too but is afraid of rejection because of the way you initially separated. So propose a fixed time period to rediscover your feelings together and on that date you both decide. But don't do it verbally. I suggest a "hidden ballot" method since each of you would be reticent of making the first commitment fearing rejection. Write "continue" or "separate" on sheets of paper and swap the papers at the same time-in a public place. Therein lies the true feelings.