Question about Pretty Little Liars? Don't read unless you know, or want to know, who killed Ali.?

umm..... well i didnt know ian was also a. i know mona was, but i dont think ian was ever a, you may be mistaken. and ian is involved because him and ali were having an affair before she died so they think he might have killed her, and they also found that video of ian and ali together the night she died. so ian is kinda a big part. and melissa is his wife so she is part of it, but only through ian. and spencer and melissa dont get along because spencer ruined melissas first fiance, wren. melissa walked in on spencer and wren kissing and got really hurt. and then melissa finds out that spencer also kissed ian when he was with melissa. so thats why they dont get along. we dont know what jenna is doing with the cop yet. thats all i can think to tell you. but you asked alot of questions that cannot be answered yet. questions that arent sposed to be answered yet. everything will come together in time.