Husband telling the wife to leave

Q: I am a 20 year old girl. I got married last year December. Recently my husband and I have been having some problems. He has told me to leave twice but from those two times I only left once which was last week Wednesday. I am currently at my father's house. My question is if my husband told me to leave, does that count as a talaaq?

Why should we follow an Imaam?

Q: Why should we follow an Imam such as Abu Hanifa, Ahmed bin Hanbal etc. as following the ways of of Prophet Muhammad (Sallallahu Alayhi Wasallam) is the best way? If Imams were correct enough then why do they have different way of offering Salaah? In this case one Imam can be correct while other three may be totally wrong in their practice.