But for the sake of argument, let's say that it is a choice (it isn't). So what? What does it have to do with you? If it is a choice, it stands to reason that being straight is also a choice. So who are you to say that someone else's choice is wrong? That's incredibly arrogant if you ask me.
Love is love. And you have no right to deny someone that emotion simply because it does not fit with what you believe is right.
Congrats to Jason Collins. it takes a lot of guts to come out, especially being such a public figure. You are showing so many that it is okay to be who you are.