You take it back by telling those it may concern that you've had a change of feeling, and you now identify as bisexual (or if not that, someone who is sometimes capable of attraction towards women). It really is that simple, and while some people might find it a bit odd I'm sure they'll come to terms with it.
There's no need to put a strict label on yourself. 'Bisexual' is simple and uncomplicated, meaning people are more likely to 'understand' you, but realise that you're only telling others for their own convenience. Your own more complex feelings about sexuality needn't be determined by what you tell others.
I've looked at sexual orientation and romantic orientation. They're supposedly two different entities. I'm biromantic but I'm homosexual. I guess its a bit complex to explain its easier to just say bi. But bisexuality is from my experience equated to female sexuality. Not for men really. Which is why I don't want to seem like I just don't want to be gay anymore. Because I'm the same as I was before. I just didn't think I had to lay out every remote inclination I might have you know.
From what I'm reading its confusing whether biromantic homosexuals are bi or gay I think generally speaking this sub category is gay. I do have some flexibility with my own sexuality. But only like I said 5%-10% of the time and still not consistently.