i agree, bad comparison.
i dont understand how you can be together for two years, and only see each other, at the most, once a fortnight?! i see my boyfriend every day. even when i was at school we saw each other every second or third day. we wouldnt really have had a rleationship otherwise.
anyway, the longest i hid a relationship for was 2 weeks, my parents found out and said "dont hide it, you can come to us with that sort of thing", and id been sneaking around with him and stuff so they didnt totally trust the two of us while we were together. we broke up after 10 months, and 4 months later i started dating my current boyfriend (now of 2 years!) and bought him home a week after our first date and they trust us completely! like from the word go they have trusted him and i, which is the best.
im not going to tell you whether to tell them or not, but in my experience im glad i told them about my current boyfriend. so draw your own conclusion from my story