Relationship awkwardness related to cute lab partner

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Ahh..I haven't been on here in a while...
I've come skulking back with my tail between my legs having realized again how socially ill-equipped I am.
I have a boyfriend of almost four years that I am really fond of, but I've developed a serious crush on my partner in computer science...she's so beautiful and intelligent and I get super nervous around her she laughs at all my terrible jokes...I'm sure she's just being nice. She's a third year and I'm just a first year...I don't want to act on it because...well to sum it up, there's that saying "Don't leave the one you love for the one you like, because the one you like will leave you for the one they love."
In the mean time I feel like I'm being distant with my boyfriend and am super skittery and reluctant to be touched in any way like a scared feral cat..it's uncomfortable because I feel guilty and nervous even though I didn't do anything. I guess my problem is that I don't know how to act around her OR him because I don't want to accidentally flirt with her but I get so flustered and awe-struck and clammy sitting so close to her during labs...
My boyfriend would probably be disappointed if he knew I was lusting after someone else. I am also not sure how to mitigate this whole "bi" situation since I have no way to express the other aspect of my orientation in a monogamous relationship. ('bi' is in quotes because I don't think that aptly summarizes my orientation.. it's more like gender is fairly meaningless compared to less tangible characteristics...irrelevant to the problem at hand but still..)
Edit: plus she's statistically unlikely to be interested in girls