Most times, People aren't worth stressing over. People come and go. Move on and go find yourself.
It is no doubt that love is a very strong force of nature. In most cases, it sticks you with one thing or person for so long (if not eternity) until you become part of that person or thing. For this reason, it is quite understandable if you keep clinching on to the hope that the person you love as a friend, brother, sister, lover or whatever will return the way they had left.
Here is the spoiler! Life is a great journey, where despite there are future seer yet tommorow is uncertain. And in the process of this journey, we meet people along the way. But we don't stay together because life itself has a different course for each and every one of us.
People will always walk into your life. While you may not yet know it, many have their sole purpose why they are inside your life. For some, it could be as a friend to teach you that you are capable of loving and being loved. Even family that you felt will stick together with you till the very end will not be there for you always like you have hoped. Some may come to teach you that not all you come across can be trusted. These are those people who act like your friend but deep inside, they are not. And then we have the enemies whom they seem to plot your downfall but are making you stronger indirectly.
What am I trying to say? In life people will always come and go. Don't expect to be with someone forever because it will break you if life split you two into two different courses where you may never see each other again. All you can do is to pick up the lessons you learnt from each of these people, positive and negative experiences, and move on.
Metaphorically speaking, THE WORLD IS YOURS, AND YOU ARE ALONE IN IT!