This onion video just came out today, and I thought it touched wonderfully well on the subject:
http://www.theonion.com/content/video/nations_girlfriends_unveil_new?utm_source=a-section
for review:
http://www.theonion.com/content/video/nations_girlfriends_unveil_new?utm_source=a-section
for review:
Iron Rule of Tomassi #4
NEVER under any circumstance live with a woman you aren't married to or are not planning to marry in within 6 months.
You are utterly powerless in this situation. NEVER buy a home with a girlfriend, NEVER sign a rental lease with a girlfriend. NEVER agree to move into her home and absolutely NEVER move a woman into your own established living arrangement. I'm adamantly opposed to the "shacking up" dynamic, it is a trap that far too many men allow themselves to fall into. My fervor agianst this isn't based on some moral issue, it it simple pragmatism. I know a fellow right now who is in the pit of misery with a girl he signed an apartment lease with for a year and has had to basically live with his ex for the past 5 months and wont get out of the lease until May. If you live with a woman you may as well be married because upon doing so every liability and accountability of marriage is then in effect. You not only lose any freedom of annonymity you commit to, legally, being responsible for the continuation of your living arrangements regardless of how your relationship decays.
I should also emphasize the point that when you commit (and it is a financial committment) to cohabiting with a GF you will notice a marked decrease in her sexual availability and desire, trust me on this. All of that competitive anxiety and it's resulting sexual tension that made your single sex life so great is removed from her shoulders and she can comfortably relax in the knowledge that she is your ONLY source of sexual intimacy. Putting your name on that lease with her (even if it's just your name) is akin to signing an insurance polcy for her - "I the undersigned promise not to fukk any woman but this girl for a one year term." She thinks, "if he wasn't serious about me, he wouldn't have signed the lease." Now all of that impetus and energy that made having marathon sex with you an outright necessity is relaxed. She controls the frame and she's got it in writing that it is for at least a year.
Just don't do it. Relationships last best when you spin more plates or at the very least keep each other at arm's distance. Look how this applies to your situation here.