Thanks everybody for your replies!

I'm officially moved in with my new crowd and so far any intrusive questions haven't materialized. But when they do I'll be sticking with the mindset the honesty is the best policy for people I'm close with while vague dismissiveness is best for those with whim I am not.
I'm sure to stick out like a sore thumb eventually. People all around me are in serious relationships, many of them over four or even five years running. But so long as people keep up this respectful minding of their own business, I'll be fine.