Don't say things like that. Pietro did what he did because he felt it was right - he made his choice. Do I wish he was with me too? Do I miss him everyday? Yes, of course. But it's not a 'you or him' situation.
You lost your family, Clint. I understand, better than anyone. My other half is dead. And then I had to choose between the universe and Vision, and I chose humanity. And then I ended up dying too. But I'm not dead now and neither are you, and we both have a chance to make a difference with the time we have. You know how strange this universe is - your family could return, or you could get ripped away from here tomorrow. No matter what though, giving up is not the answer.
Whatever we have left, we fight to protect. Or at least, that is what I'm going to do.