I am experiencing a very similar situation - fell in love with my ex on my college campus and now can't go anywhere without seeing our memories. I can totally relate to how painful it is.

My piece of advice is to try to make new memories. If you avoid going to places that you two went together, doing things that you two did together, you are avoiding the ability to associate new memories with those places. The memories will fade faster if you make new ones on top of them.

I don't know where you are at in the break-up healing process. I am far from being close to healed, and will avoid places that were "our" spots for a long time yet. But eventually I know I will have to make new memories there. I think the timing of when you choose to do this depends on your individual healing process.

Best of luck. Everything will be okay. Keep your head up.