Hi anna_178,
Welcome to the boards! We're happy to have you here.
So it sounds like you have identified with bisexuality for a while, and while that still might be the case, you've also been doing some wondering about lesbianism. It seems this was spurred by a kind of sudden disgust with being with your boyfriend and it's making it hard to be around him.
First, I want to say that these feelings are totally normal and to start feeling physically feel uncomfortable around someone you otherwise like is frustrating and confusing, but not uncommon, especially for queer people. I think it's a good idea to break up with your boyfriend since even if you learn that bisexuality still feels true to you, it's clear that this relationship isn't thriving. The respectful thing to do will be to tell him your feelings have changed and that you'd like to explore more of yourself outside this relationship.
Figuring out how you identify and what that really means can be a super challenging process, that's for sure, but I do want to note (and hopefully this might ease any urgency or stress you feel about this), these kinds of feelings and labels tend to change and evolve
with us, not against us. Meaning, your orientation or partner preference is not this illusive thing that you need to catch and pin down. It's in you the whole time and the looser you tug the reigns, the more space you give that part to develop. It seems like a very straight forward path, like you are supposed to just "realize" one day who you actually are, but the truth is you already are that person and labels is just how
you choose to define it,
if if fact you want to define it at all.
Here are some resources i've pulled for you to check out. Once you give these a look, come back here and we'll keep talking about how all of this feels to you!
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What's the Bisexual/Pansexual Thing All About Anyway?
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I'm Bisexual, So Why Don't I Feel Exactly The Same About Men And Women?
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Living Without Labels