Yes, it's possible, just like a straight man could fall in love with a lesbian woman.
Yes, the degree in which a gay man may love the woman may vary, but yes a gay man can love a woman just like any other person. I fell in love with a Woman and was about to propose, unfortunately (or maybe fortunately, depending on how you look at it) it didn't happen. I still loved her for years later and today still hold special feelings for her, in the long run it was better that I didn't marry her. Being a Gay Man doesn't mean you can't fall in love with the opposite sex, you can't "make" your heart fall in or out of love, it happens regardless. Though in all honesty it is less common for a Gay Man to fall in LOVE with a woman, but we still love those we love.
She can possibly make him fall in love with her by being his friend, but she will never make him attracted to her.
Because he is a gay man
No, although a straight man can love a gay man as a best friend.
Yes, because I was that Gay man she fell in love with.
There is probably no such thing a gay man who is secretly in love with a straight woman, except as the equivalent of a straight man's "man crush" where he really likes the woman as a friend.
No, it's more likely that he has other issues, such as commitment issues.
If he's the right man, he'll fall in love with you. If not, move on.
Straight people fall in love with and prefer having sex with people of the opposite gender as in man+woman. Gay people fall in love with and prefer having sex with people of the same gender as in man+man or woman+woman. There is no way of knowing just by appearance.
Yes, but this will only end badly for the woman.
yes