Is love rat like this? Have a current girlfriend. I will still reply to my ex-girlfriend. I won't come back. I will definitely come back. I'm an ex. Is he love rat?

Since you are his predecessor, why should you test him after he has his present job? It always matters. Breaking up doesn't necessarily mean breaking up completely. It's just that they deliberately stopped touching, but buried it in their hearts. His reply to you does not necessarily mean that he is a scum, but your temptation shows that you are still unwilling to let go. Don't try again. It's rude to his present position. Even if he is really love rat, you don't need to remind him of his present position. He will feel it.