So can someone explain what the hell is going on at the moment? Heard the deal was tweaked and something about the UK not splitting and also something about a second referendum?
The deal hasn't been tweaked at all. As per the EU's statements the deal will not be reopened. What May is proposing is that if the deal is passed the Tories will create legislation in Parliament that places into law EU employment laws and environmental laws. And if passed, a second referendum, the confirmatory vote.
Its a fudge, and her words carry as much wait as the political declaration from the EU. Its a "promise" which could easily be reversed.