My ex is going out with other people that makes me sad.

:( it makes me feel really sad.

It will, but don't let it get you down too much.

If he / she finds it so easy to get over you and move on to someone else then it probably means they weren't worth it in the first place.

Just try and live life to its fullest and be happy and smile a lot. Pretty soon I'm sure you will have heaps of people wanting to be with you because you are so much fun!

I personally think that Elementary School is too early to be having exes...

I agree with Skell... Hold your head up, things will get better. Doubtful that this person was your soul mate...

Keep looking, one will come along soon enough!