He lost trust in us.

It's the second time we broke up. He is American and I am Taiwanese. We had some cultural issues while dating, but compromising made it work. Recently he felt stressful that I clammed up when I am in a bad mood, even though I really tried to change (opening up to him) after the first breakup but still he said not good enough.

I know it's crucial to be completely open to the closest person and now he's back home for summer, and sees clearer that this problem is not good for future together if we ever encountered severe difficulties, we wouldn't be able to deal with them 'together'… I said I'd wait no matter for how long because I am willing to change, but he said don't waste your time.

I really want to get him back so I want to hear different opinions and know what to do.