After reading your question, I feel that A, who is greatly troubled by you, has also fallen into unavoidable troubles. Maybe you haven't found out: the other person has actually fallen in love and can't extricate himself! You care too much about other aspects and too little about him, which brings him great pain! In fact, you have always cared about him, but unfortunately, you have never expressed it to him naturally and timely through your own mouth! At present, as long as you simply express your concern and consideration for him, and nothing else is involved, the pain and troubles of both of you will disappear!
Now, your mistake lies in the improper way of showing love! His mistake is that deep love weighs heavily on his fragile heart. Of course, the purpose of telling you what you know is that you can withstand twists and turns more than he can. Therefore, in the future, he needs your concern more.