I've found that what is the most helpful in getting over a break-up is time. Time really is a great healer, unfortunately you have to suffer through it. 3 months isn't all that long. You should, in time, start to think of her less & less. The amount of time is variable. If you find that you aren't moving on & are still obsessively thinking of her after a very long time, then it would probably be good to go see a therapist & talk about it.

So sorry you have to go through this. It hurts so much.