Acting : "Generous" Actors are SO GREAT to work with by Peggy Fields Richardson!

So what do I mean by that? Let me explain an experience I had. I don't think I handled it well--actually I didn't handle it at all. I was cast in a movie several months ago. It was a small (but good) role, and the main character with whom I originally rehearsed was WONDERFUL. You know that "connection" you get working with an actor when things just flow so easily, you play off one another and every line gets better than the last? well, that's the working relationship I had with him. But weeks later, when I arrived on the set, he had been replaced by another actor, and the film had been in production for about 3 weeks by the time I got there. That means that the new lead actor had had the time to work with the director a lot before I arrived. And by the time I got there, the new lead actor had taken it upon himself to rewrite our scenes together, encouraging the director to go with HIS version. It was no accident that HIS version had eliminated my very best lines, taking my character from a flirty, fun character to play down to... a bore. I had been really stoked for the role, so excited about working with the first actor cast (now replaced), and the lines that had been originally written for me gave me a chance to show my comedic timing. The scene had shifted from a scene about two characters to a scene about one character and my character had become an afterthought. I didn't know how to handle that, and so I just stared stupidly at the lead actor when he gave me my new script and I saw that my best lines had been cut. I could tell the disappointment showed on my face because he said, "Oh, I didn't mean to cut your lines." Yeah, right, huh? He was TERRIBLE to work with, insisting that HE have the camera even when I was delivering my lines (most of which were now written in to be off camera). I have to say, I will not choose to work with him again. The other character with whom I had scenes was GREAT. He made sure that we both had the opportunity to shine in the delivery of our lines. It was obvious that he wanted us BOTH to be recognized for good work, each to have our camera time and the opportunity to do our best. He was someone of generous heart as an actor, and he was wonderful to work with. I love working with those kinds... people who share the air so everyone does a good job. How could I have handled this entire situation in a way that didn't make me seem like a crab or complainer? Any suggestions? Thanks!