They stripped away everything that made him who he was - took his memories, changed his body to match their own image - and expected him to become one of them. They failed. In the aftermath of their failure, he and they came to some respectful understandings.
Or so he thought. Until they betrayed him and tried to do the exact same thing a second time, as if no understandings had occurred at all. Not just to him, but to an entire shipful of his people. And when they failed again, they tried to destroy all of them.
Even after that he willingly allied with them against his own people. And even after he helped them that time, they betrayed him again.
Then, when he was exiled from his own people because of what they did to him, and the only option left to him for survival was to create his own army in self defense, in their paranoia they wouldn't allow him even that.
He who called one of them brother
Once upon a time he allied with one of them to escape a common enemy. The two together succeeded, and he was so impressed with the other's honor that he called him brother.
On the strength of that experience, he sought out the same one again later on for another alliance. In return he found no recognition of that shared experience at all. He endured imprisonment, their extreme paranoia, and the loss of his entire hive of loyal followers, all without losing patience. He helped save the life of one of them, someone of no importance to him whatsoever; to do so he worked without complaint among them and never once asked to be fed, not even when he collapsed from starvation.
They used him and put him back into imprisonment when they were done, and when they no longer need him they will throw him away.
So who are the actual good guys and bad guys of Stargate: Atlantis? Because I'm finding it difficult to sympathize with the humans of Earth. They have no honor, they never learn and they do their best to burn every bridge they encounter when they could be building them.
It would be much different if the wraiths consciously chose to feed upon the humans when they could choose other food sources - but they don't have that choice. Their only choices are to feed upon humans or to die. How are they evil by not choosing to die? And how much more fascinating a storyline could there have been, exploring the nature of a sentient race that must feed upon another sentient race?