This can also make you think wildly. You are really not that sensitive. You think too much. Maybe he means that he has forgotten his ex-girlfriend during the year he was with you. I think he should have written it to his ex-girlfriend.

You are too sensitive.

Boss, you can’t speculate on this. If you really feel uneasy, just ask him. According to what you said, my boyfriend and I have been together for 3 years and he changed his QQ name to Qing. Mie, should I jump off the building?

Your thinking is too extreme. The more you think about it, the more real it feels and you can't think of him. Women are like this, suspicious. You said it was just in case, there was only one possibility like this ten thousand miles ago. Stop thinking nonsense and ask him to change it while you are still his girlfriend.