She's desperate. She clearly doesn't know what she's getting herself into if you say yes. She'll die on the inside, on an average of 15 times a day, and continue spinning in her grave :\.

Walk away dude, you're better than that. If no feelings were involved, then wtf, just go ahead- Sex, chocolates and laughter all make for a healthy mind.

Not everyone is capable of being considerate, though. If you aren't sure, you're probably lucky enough to be a part of the minority. So do what real men do, and preserve her dignity and sanity for her, since she isn't in the right state of mind to do so herself, at the moment.

She's just using sex so that you'll still come back to her, its something that will slowly eat her inside. She won't be happy in the long-run with such an arrangement. She wants more, but rather than lose you completely she's willing to give up a part of herself so she can be with you once a week.