You are probably right about being played. But time eventually heals things, and one good turn gets another....
I have a story for you. A while ago, when I started the job I currently have, I met a man and we ended up having an affair that broke up the relationship I had at the time. I thought me and this other guy were going to start something, but then it fizzled. He played games and tried to avoid me, and then eventually told me outright that he was ending things. I moved on, but I was bitter and angry (though I probably deserved it for cheating on my then-boyfriend; it served me right). Of course it was difficult to deal with his presence at work, so I adjusted my schedule around him. Whenever I was forced to be in contact with him, I would play it cool. I would act like he didn't exist. That's what you should do, too, in your case.
For me, ironically, the pig I messed around with tried to get back together with me again some time later. So I teased him, made it look like it was possible. Man, did he come on to me hard. He was so desperate! Then one day I ended up meeting the man who became my current boyfriend, and I decided that the teasing with the other guy had to end, so I dropped him like a hot potato. And he was hurt bad -- he couldn't disguise it.
Your guy will get his just desserts as well. Feel no sympathy for him, and do not analyze his motives. And don't avoid him at work! Treat him like something that's in your way: move around it. Ignore him. Act like he doesn't even exist. He may try to come back to you one day, like in my case, especially since Cancerians are best motivated to make a move when something they want is moving away. But you keep blowing him off, act really cool, like you don't need him.
Because you don't need him. Waste no more time or thought on him. He no longer exists to you.
Incidentally, the fact that he was sending his brother to do work where you worked indicates that he really wanted nothing to do with you and was definitely trying to avoid you. That was a really big sign. He is emotionally immature. He deserves to be alone.