Everyone's alone in the world. No one is going to be around or there for you forever. You mustn't expect others to constantly be at your side to make you happy, at the end of the day the only person you can truly rely on is yourself.
If you don't learn to do that then what good is it when you come to situations like this? Bad things are always going to happen, that's just life.
I'm not trying to come across as rude I'm just being honest but; Rather than turning this into a strength you're acting anything but strong.
You really will end up with no one if you have so much self pity.