It's pretty clear you are the toxic one in this relationship - and then go on to play the victim. Which is classic narcissistic behavior.
This is all good news, really. It means with the right psychological help you don't need to keep hurting yourself by listening to your heart. Remember: the heart is cruel. It would rather feel than think.
I know you won't listen to this. I didn't really write it to be persuasive, just precise.
However, I do want what's best for you, and the pain you are feeling, I think it will be multiplied, it will at least continue as long as you judge people morally based on their beliefs on policy. As long as you let politics be more than people. I've done it. Please don't do it too.
Once the pain is multiplied, I think you'll see, for the first time, what I mean. And for the first time perhaps know your friend and others you've abandoned. And most importantly, maybe for the first time you know yourself.
I hope you learn to see.