If your roommate means date by hanging out together doing fun things, then go for it. If she meant it in like a threeway relationship, then I'll tell you to think about the pros and cons, not just for the reasons that you're lonely or on impulse.

You might have to share each other and it takes a lot to make something like this work. It could end up good but then it can also end up badly with hurt feelings and such. If you're uncomfortable about it or there's no attraction, then maybe you could just turn them down gently.

But it's entire up to you and the decision you'll make.