<human>: Can you summarize the given text in a few sentences?

I'm currently in a relationship with a girl (I'm a girl) and we've been together for about 1.5 years. I'm 20 and she's 19, both in the same college. In fact we're rooming together. We're both bisexual, and for the past few months I feel like I've lost my attraction to girls, including her. I feel that I'm no longer in love with her. The relationship have gotten boring, and we're always fighting over petty things. Lately, I figured that I no longer want to be in this relationship because I have just fallen out of love, and I don't think I want to continue trying anymore (as harsh as that sounds, it's the truth). Everything I say "I love you too", I feel like I'm lying.

Well anyway, here's the deal. I'm studying abroad in the states right now (I'm originally from Hong Kong) and I'll be heading back on June 1. In September, I'll come back to the states and continue my studies for another year and half. This is where the problem is; I've already leased a house, in which I'll be sharing with her and three other roommates (5 in total). And to make it worse, all my closest friends in the states are these 2 girls, that are mutual friends with my current girlfriend, that are going to be my future roommate.

Basically, girlfriend = A
Mutual friends = B + C
A + B + C + Me = a close group of friends, and will be rooming together for at least a year

I don't know how I can break up properly without making things awkward next school year.The only thing I know that can assist this break up is that I'll be going on a trip to Europe from June 10 - July 2, so if I break up with my gf before then, I'll have close to a month of complete no contact with her. Hopefully that will help us move on.
<bot>: I want to end my 1.5 years relationship with my girlfriend, but we will be living together with our mutual friends for another year. How to make the break up smooth and not awkward in the future?