It's a Facebook question. Please help???

[Sara]

So I have a crush on this guy since 8th grade and I was bullied very bad so he might not like me, anyway I was just looking at his facebook one day and it said this girl added him to her life event and it said him and that girl was in a relationship. And I looked at his about me and it don't say had he is in one but in hers it does. And on the same day it said she was married to someone else when she put that they are in a relationship. Also in the past it said she was in a relationship with a few other people in the same month. So what I was wondering is how many people can you say your in a relationship with? And what is life event and how does it work? And since it says she is in a relationship but he says status doesn't show at all, not to even say he is single or nothing could this mean they are dating of no? Just some advice please. Thanks for answering guys.