I don't even know what season or episode I've been watching. Just started this week from where Sophie went missing.
And last night, Rick killed Shane. I learned that they're best friend but Shane had always been a bully because she's jealous of Rick for taking his wife and son? So is Clay Rick's son or Shane's son?
lol, I suggest starting from season one. I think the episodes you've seen are season two. Carl is Rick's son. Rick's wife Lori, thought Rick died, so she got into an intimate relationship with Rick's best friend Shane. When Rick was reunited, Shane grew jealous because he wanted Lori, and they kept their relationship from Rick... but Shane became increasingly disruptive and Rick finally caught on, but Shane was jeopardizing the safety of the whole group, so Rick finally became a man and killed Shane.