No, I've changed. What's the next sentence?

I didn't change this sentence, it should be said to lovers. What's the next sentence? You should truthfully tell the reason for your "change" according to the situation between you. For example:

One, it's not that I've changed, but that you're drinking and gambling and staying out at night. You've changed me.

Second, it is not that I have changed, but that the situation has changed. We should adapt ourselves to the situation.

Third, it's not that I have changed. Originally, we were a running-in process together. I found that our temperaments and pursuits are different. When we are together, we will not be happy in the future.