Promises you must keep.(cosmo for your guy)

When you tell your girlfriend you'll do something, she assumes you mean it. And slacking won't just piss her off, it may make her doubt your word in the future. So do both of you a big favor and follow through on the phrases below.

"I'll call you right back."

We know how it is: You're talking to your girlfriend when you get hungry. You tell her you're going to make a sandwich but reassure her that you'll phone once you're done eating. Flash forward two hours: The sandwich is long gone, and you're engaged in a bloodbath on your PS2. Meanwhile, she's wondering where the hell you are. "When you tell her you'll call right back, assume she's thinking it'll be about five minutes," says psychotherapist Robert Mark Alter, author of It's (Mostly) His Fault. If you know it'll be two hours, say "I have to deal with a few things, can I call you later?"

"I'll take care of it."

You're a busy guy, and you may have more important stuff to do than fix a leaky faucet in your beloved's bathroom. But when she asks for help and you agree, she's counting on you to get the job done. "Women these days are independent and don't like having to ask for anything," says Bobble Reid, author of Clueless. "When you don't take care of it, she has to keep bugging you, which makes her feel like a nag."

So the ...