This question must be carefully considered, because if you choose to hide and tell, it may cause misunderstanding and influence on your best friend. If you choose to tell your best friend, the relationship between your best friend and her boyfriend will break down to some extent. Even if you choose to be together, you will feel bad about each other and will not trust and trust each other. If they continue to get better, they will be very tired. A sensible girlfriend will do. If you are an irrational best friend, she will say that you are a guide.
You seduce her boyfriend, make her boyfriend like you, and then abandon her. At this time, you are like a third party between them, not only distracting their feelings, but also ruining your girlfriends. So, in this case, would you still choose to tell your best friend? But if you choose to hide it, your girlfriend will also say that you are lying to her. If her boyfriend tells you without your girlfriend's knowledge, you can choose not to tell your girlfriend.
Let them solve their own problems, but you refuse your best friend's boyfriend. You must keep enough distance between you, and even don't contact when it is unnecessary. In the face of such problems, there are certain disadvantages in choosing to say or not to say. Everyone's situation is different. How to choose depends on the situation. In the face of friendship, we should avoid unnecessary misunderstandings, and love is the same. Although love is easy, marriage is really not easy. Do it and cherish it.