Have u been involve in a married man?

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I have this one classmate in my Theology class. I consider him as an elder brother. Actually, he is very friendly and sweet. He always bought us something to eat during class for the class start at 6:30 and end up at 9:30. We are usually hungry in the middle of the class. I never put malice in the way he act towards me. I thought its only a brotherly gesture but now its seem so obvious that he likes me very much more than a little sister. He is still not saying anything but his action speaks louder for what he feels. He is already a married with 2 kids. What will I do, do I need to treat him the same way I have treated him? Or shall I have keep away from him? Help please!!!