Not once, but twice...and see, the thing is regardless of if you wait till after your one year aniv or not , you're still going to break his heart and the damage will be done. The difference will lie in when, inevitably, the question comes up, the"how long have u felt like this" , the longer you have been lying/pretending for his sake, the worst he's going to feel. There is nothing more humiliating then someone pretending to love you because they do not believe you to be(this is how it feels from his side) strong enough to deal with reality.

Considering you are already going to hurt him, and you did not do it intentionally, I recommend you stop worrying about him and help yourself. Does breaking up with a great guy who loves u and doesn't deserve it make u an asshole? yup. Does it suck that you've fallen out of love with him? yup. Do you have to live unhappily keeping up the illusion that you love him for "his sake"(as it is not really about him at all)? No way. This is the hand you've been dealt, believe me next time you'll get to be the one on the other side of the deal. And once you've let him go, and the intense guilt you feel starts disappearing you can start to figure yourself out, in the end, that's how things work out, relationships come and go, the only person you really have to live with for the rest of your life is you, and once you've put that into perspective what seems more important, his feelings or your happiness/well-being ?

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perhaps there's no other way, other than letting him know, face to face, what your end of the truth about your relationship is. if he's the good guy you say he is, then maybe it's more than simply feeling obliged, but actually wanting to do right by him, by ending a relationship the best way you know how. if a person means a lot to you, i doubt there's an easy way of doing that.

if you're after specifics once you decide once and for all that you're going to break up with him, then maybe these can help: go over what you're going to tell him and ready your answers to some questions he'll probly have ("why?" "what did i do?" "is there someone else?"), choose your words as best as you can, bring him to a quiet place where you can have space enough to talk (i once broke up with someone in a park), and tell him why you believe you can no longer continue the relationship (or whatever you've decided to say).

hope these help, somehow.

I've been here before and it's difficult no matter what you do.  I may not be much help but I think honesty is the best way to go.  I wouldn't be too brutal but if he's as close to you as you say, than he'll see through the b.s.  From my experience, the sooner the better.  The longer you drag it out the harder it becomes on you and him.  You both deserve a shot at figuring yourselves out and if there's any chance at saving a possible friendship than do it as quickly as you can.  Both of you will be upset for a while but you can get through it, we've all survived breakups.  Good luck!

"Normal is not something to aspire to, it's something to get away from."

obviously we don't know your boyfriend, so we don't know how he'd take this, but maybe if you tell him that you're questioning your sexuality he won't take it as personally... okay, some guys take it VERY personally, but if he's reasonable you could explain that he didn't change you to be this way, but you can't lie to him anymore.

it depends whether he'd think that he was the "reason" you went gay or w/e.