Every experience shapes you in some way, but a tough breakup is one of those things that will have an impact on a lot of facets of your life. This can be both positive or negative depending on what you took from it and your reaction.
For me personally, a positive is that I know the type of love I need and I deserve now. The negative? I will be more emotionally stunted than I already am. It took me more than a year to tell my ex that I loved him (I felt it earlier but the words didn't come because I was afraid) and I only told him after I felt that we were going to move forward together. We didn't. So, now that leaves me in a more careful position. I will hold on to my heart a lot longer.