Do it. In fact, he knows he has a boyfriend, and so do you. She has a boyfriend, and both sides know each other. Finally, half-hearted things naturally come, which shows that she is still not so firm about her boyfriend, for example. If you really want to be nice to him, you can talk to him and show your attitude. This kind of thing. Although the practice is not authentic. But if you really love each other. That's no problem, but you should be careful yourself. If she really becomes your girlfriend, she will. Similar things will happen in the future. What should you do?