Swap sadness

I signed up for my first swap. I had so much fun picking out surprises for my partner. I merrily sent off my package, and waited for the person who got me to send me a package. Well, it is now officially June, and I have not heard anything from my person. My sender doesn't have a blog, so I don't know if she was having family issues, and I haven't gotten an email/teaser/sorry I flaky/anything. :(
I am not that upset about not receiving anything, for me the whole point was to make someone else happy. But I am a little peeved knowing my sender got a package, and didn't make an effort to send one out.

Does this happen a lot in swaps? I am kinda wary of signing up for another one is this is the norm.