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At this time, what you should consider is not why your boyfriend changed his ex-girlfriend's remarks to hehe, but why he changed his remarks. Obviously, you can delete things directly without any worries. Why do you still keep your ex-girlfriend's WeChat? I think it's more in your boyfriend's heart. I also want to see her daily dynamics through the circle of friends, or let her see her daily life.
But judging from the notes he changed, you can see that your boyfriend doesn't love his ex-girlfriend in his heart. If he loves someone, he won't change notes so casually, at least he will think of a better name. The reason why he didn't delete it is that he still has some feelings for himself, or he wants to show off his feelings with your ex-girlfriend through a circle of friends and that his life is much better now than before after they separated.
Your boyfriend is also very thoughtful. He knows that you will be angry when you see his ex-girlfriend's WeChat, and he also knows that he changed his words. At least he is thinking of you in his heart, worried that you are angry and worried that you have a conflict with him because of this ex-girlfriend. Will change the comments. So don't care too much about this matter. Isn't it the ex-girlfriend's WeChat? I really didn't want to accept it, so I just told him to delete my ex-girlfriend's WeChat.
So, don't worry too much about whether your boyfriend has feelings for his ex-girlfriend, but trust the feelings between you.