how to get over your lover?

Time takes away the memory but not the grief.

Yes that is true at this moment when the wound is still fresh it will feel like you are abandoned/trapped in your own heartaches. But I think you should be patient as all wounds go through a painful process of healing. But in the meantime it is healing there are many things you can do to ease the pain somehow. Go out the world and meet friends that may help you in your feelings. Explore the world like you never had done with your BF. And lastly move on how slowly the time may go against you trying the first step of getting over your ex would be the next best thing for you.