How can I cope with the loss of an important relationship even though I have another bf?

The pain is real. Even though you are trying the best as you can, please recongnize and accept that the images and memories of the lost love will come up from time to time, because this is how we cope through reminding ourselves something is gone and won't come back. Just remember to bring your thoughts back to the person who is next to you now and appreciate his/her company in this life journey.