I've been with this guy since about January.. we've lived together since then as well. He moved in with me and my roommates, we were all mutual friends. Well... to keep this fairly short, most recently I've discovered that he is planning to meet an ex-girlfriend for what I can only assume is sex, less recently I found him having explicit text conversations with another ex. I confronted him about the text messages, and he copped out of it saying he doesn't know what he wants, he values what we have, and I didn't get the whole story from the texts.
At the time I knew this was crap, but I gave him the benefit of a doubt. Well, now we haven't had any physical relations in months, and we barely talk so I followed my gut and discovered the planned meeting. I'm tired of this... How do I break up with someone? I've never had to before, and I'm afraid of putting undue stress on the relationship I have with my other roommates. I'm also afraid of the financial implications of breaking up; I won't be able to afford my share of the rent here which means everyone will have to move. What should I do? 

