Owens left withouth telling Nux. He looked for him all ober the building but can't find them. 2 days later, he find out (in a web news) that Owens' ship departed two days ago because of personal reasons (his pregnancy). He looks so pitiful crying and wondering why Owens left him without saying a word. Season 1 ends at chap 50. There's no update for when the s2 will come out.
Owens left a robot to Nux and that robot prepares all his meals and greets him and that makes it more painful. Imagine going in their apartment only to be greeted by a robot and do what the Owens usually do (not sex tho). When he found out that the Owens are gone he hit that robit hoping to destroy it and cried while wearing Owens' clothes.

Spoiler
Chap 50 is the most painful chap I've read in this manhwa so far. Nux is so pitiful. Damn Owen for abandoning Nux like that. 1 year later and Nux is still waiting (he graduated, btw)
2nd season is Nux on Earth and the Appearance of Owens again