I have been dating my girlfriend for more than half a year. For more than half a year, her personality signature on WeChat has not changed, and I didn't care so much.
I think it's nothing, just a name! Men should also be generous! Sticking to this problem is not good for your relationship! But if my feelings for you were in place, I wouldn't keep that signature! So you should continue to be kind to your girlfriend and let her forget the last person completely. Bless you!