How long after a breakup will I feel better?

Everyone actually takes exactly enough time to grieve when then lose someone they love, but some of us are just surprised at how much the loss was, and therefore are surprised at how long it is taking. Do not gauge your speed against what you've seen in other people; you actually don't know accurately how long other people took to heal. Take your time. If it is taking a long time, then obviously you loved them a lot. However, if you really feel like you're stuck and it is taking an unreasonably long time, you can look into getting therapy to get closure.