Life is a bitch, but that's not anything new for anyone in this day and age.
You can give it all, like I did. You can love from the very bottom of your heart, give them your entire being, and care for them with your soul and at the end sometimes it just doesn't matter to the person. They can easily end anything without looking back and thinking twice. All there is left for the person behind is to grieve, cry and mourn, then eventually at some point move on with their lives. As if that's possible. It's a lot easier to say then to accomplish.
I tried my very best with everything I had, I was attentive, I cared, and more...but at the end easily it was shattered.
You can be left with questions as much as you want, and you can console yourself saying in the future, but really all you're left is the bitter feelings of the aftertaste and future is uncertain. Good or bad things come, it is a fifty fifty and no one can guarantee you a better time, a better person and happiness. Most likely things will get complicated as time goes on and you are left with the scars to live with after all that you have shared and lived through. It becomes nearly impossible to look at life, love and relationships after each hit, each battle. It becomes harder to believe, to truth, to be certain of....It is a fleeting world after all.