Please help me remember

My memory is terrible. The only thing I can remember from the midseason cliffhanger was that Avery is pregnant and didn't know who the father was. But were Max and Avery a solidified item? I was wondering why she was getting so upset at Max flirting with that other doctor, because I didn't think they were an official couple then, or even before they had their 3 some. I thought they were all single and no commitments had been made, they decided they didn't want the 3 some. Just the mystery behind who the father is of the baby?

Max and Avery having a family on the boat will ruin the show sorry if that makes me mean or whatever. They all need to break up and date other people.