Well Jim was just as delusional and chasing Hollywood talking about all his screen plays, good meetings and how some were being made (two years later and I've still not heard anything).I think it was her desire to chase Hollywood that was the nail in the coffin for the pair, you can tell in her YT videos from that time that her heart wasn’t anything other than herself.
I think Jim loved encouraging Tanya and setting her up for a fail as he always seemed jealous at how much more successful she was. Remember at her book launch when he did a speach saying Tanya "was taking Hollywood by storm" after that cheese girl tiny part for some mobile show that he knew was god awful.