I'd say it was essential to get to know and talk to his other interests as much or as little as you feel comfortable with. Openness is what it is all about.
I will leave it to others to answer about jealousy. I am not jealous by nature and luckily OHb and I have never been jealous of each other. Hope this helps
"The secret of life, though, is to fall seven times but to get up eight times"