No, you'll fall in love many many times but they aren't all going to be the one you're meant to be with... After several heartbreaks you'll find he who is worthy to put a ring on your finger!!!!
Yes. Love thy neighbour. That means human requires some one besides him/her to be loved, until last breath. The love therefore has to continue till such moment. Yes, it happens only once during his/her life! True.
Ideally Romantic love should only Happen Once in life and then it is sublime and special to the individuals.If it is unrequited then it is very painful but does not stop the unfortunate victim from falling just as deeply for someone new. I think for many people Romantic love can and does happen several times in life and for others it never happens. In some cultures the concept of romantic love does not exist as a man will love his mother more than his wife who he considers to be his property.
Of course other forms of love exist such as parental etc but I assume you mean Romantic love.
No, that's not true at all. I have been in love several times. It depends on your capacity to love. Out of all the 7 billion plus people in our world, what would make you think there is only one person for you to love? Not likely.
Huh ! Ah, no. Love is continuous and constant. We love family and friends. We love our pets. We love ice cream on a hot day. We love a significant other (sometimes many). I loved a half a dozen and lusted a couple hundred before committing to the most significant, my wife.