Also an English guy, I don't think you understand that you've not exactly treated Scotland very well and that's one of the reasons it wants to leave.
Scotland has been treated very well indeed. When it joined the Union its people were piss poor and its "government" was bankrupt. It's now a wealthy first world country, with lots of MPs in its Parliament, large amounts of money spent on its people and it's contributed multiple Prime Ministers and senior government figures.
Despite all that, a large number of Scottish people have repeatedly attempted to trash their own country and England too by blindly supporting policies that are - to put not too fine a point on it - communist. This is a part of the world where as late as 1989 an MP was trying to get elected by recalling "Red Clydeside". This is a part of the world where hatred of Thatcher is practically a national pasttime, although her crimes amounted to ending communist policies like massive state ownership of industry and trade union control. Scotland failed to adapt to deindustrialisation and failed so hard that decades after the rest of the country has moved on, lots of people there are still nursing a massive grudge.
Scotland's current state isn't because it was badly treated by England. Arguably the south of England saved Scotland in the 1980's. Leaving behind Soviet-style economic policies wasn't a choice, it was an inevitability, as the USSR would prove when it collapsed around the time Thatcher was booted out.
Now we see in the Yes campaign socialism rear its ugly head once again. The most common reason I've seen for voting for independence is that the nasty mean English vote Tory and Scots are fairer, kinder and more hard working than that. Even Salmond, the man who runs a political party that has basically mainstream economic policies, doesn't hesitate to take a giant dump on the English by implying that an independent Scotland would be a utopia of milk and honey once the hated Tories are overthrown. When asked what kind of spending cuts would happen post independence Sturgeon simply said "there wouldn't be any".
The reality is that Yes is campaigning on a framework of economic illiteracy. If they win independence, there are really only two possible outcomes - one is that the rest of Scotland manages to counterbalane the hard left somehow and Holyrood runs governments that look much like those in Westminster from an economic perspective. The other possibility is that disaster strikes and people who want to roll Scotland back to the chaos of the 1970's actually start winning elections, in which case Scotland will probably end up looking like Ireland did for much of the 20th century (dirt poor with large amounts of emigration).