You have to love and value you before you can let go of the past and move on to love that is happy and fulfilling.

We can never control how people treat us or how relationships end... but we can absolutely control how we act once those things happen. The best way to find the right kind of love is to get into a relationship WITH YOURSELF. Investing in yourself reduces the chance for a bad relationship because you value YOU.

Allow some time to grieve. Break-ups can feel like a death, and grief is not only normal, it's necessary. Give yourself some time to feel the loss of what was, so you can move on from it.
Accept what you miss. There will be times that the good things will try to drag you back emotionally (and physically). Letting go is a process, not a switch that gets pulled. Allow yourself to miss things that were good... and remember what didn't work so you fully accept why the break-up happened in the first place.
Take your time. There's no schedule to get back on the market. Many people falsely believe the old maxim that "the best way to get over someone is to get under somebody else." That usually doesn't work—although it might be physically gratifying. Too often, it leads to reassigning old feelings to someone you don't really know.
KNOW that there are others out there. It won't be the same with someone else... and that's a good thing. Otherwise, it would lead to the same ending. When you're ready: start a new hobby, take a class, and spend time with friends and family who care about you. By surround yourself with people who are positive and working on themselves you will not only drastically improve your outlook and attitude, you will also improve your choices in potential partners.