Harvest Moon IoH : I don't know if I can get Pierre back!?

I was concentrating on trying to breeze through my pregnant stage that I was forgetting to talk to two houses of people, Regis + Sabrina and Pierre. I've been working on getting Pierre and Natalie Married for a while and now that he left the Island I don't know what to do. When will he come back? Will he stay permanently when he does come back? Oh and he left on the 3rd year in winter (around the 20th) Please help me! :'(