I've been seeing this girl for about 6 months now and it's great, but I've decided now that I won't consider her for an LTR. She really likes me and recently started crying after sex because it was intense and she "doesn't want me to throw her away like a piece of shit"...

Should I:

A. Tell her straight up that we won't be together.

B. Keep going without making any promises but being ambiguous. Eventually she will decide that it's been too long and leave I guess.

Option B obviously has less risk of her leaving immediately, but if I do that will it blow up horribly and hurt her deeply?