Believe it or not, letting go is the secret to getting over a breakup. You certainly should allow yourself to grieve over the separation from a loved one. If you have no pain, the relationship was a sham. But, in no way should you allow it to go on and on. Concentrate on the new things and opportunities that life will bring. Let go. I was working on a research project for the isolation of B cells and my colleague and I became very close after spending endless hours together in the lab. Funny how as soon as the project ended, so did our relationship. I was broken hearted, but put my energy toward my next assignment and the heartache dissipated in a few days.