The worst thing is being in love with someone who doesn’t love you back. This has happened to me several times. One never said he loved me, but I hoped that some day he would fall in love with me, he never did. Another one said he did love me, but he actually didn’t. That one was probably the worst, because I loved him deeply when he left. I grew to despise him (which is what everyone told me I should have done in the first place, because he was a big douche-bag, but he was charming and handsome and said all the right things at the time, then he dumped me and played that game with someone else, and somene else and someone else ad nauseaum). Another one probably did love me for a brief moment, but then he fell out of love with me when he discovered that there’s lots of women (and men) in the world that he’d like to be with too. It’s devastating and colors your world from that point forward. But if you are able to move forward, you can see when you look back, that it’s a good thing that you didn’t end up with those particular people.
When you love someone and they love you back, it’s the best thing in the world.