After reading your above description, you broke up with your girlfriend for a month. Your ex-girlfriend changed the micro-signature to "Don't keep people who love you waiting too long". What do you want to express?

I think it's been over a month since you broke up with your girlfriend. Your ex-girlfriend changed the signature of WeChat to "Don't keep people who love you waiting too long". On the bright side of this sentence, she is urging her boyfriend to take the initiative to chase her. But it is not clear who her boyfriend is referring to. If you really think you are that person, you have to feel it out to be sure. Now you have an idea, maybe you think too much.