Inca can you eli5 both sides and why you voted?
The political elite in the UK are closely tied to Brussels and the unelected growing EU power structures. They have been gradually moving away from what the people agreed to - a common trading bloc - towards a supranational state with free movement of labour. An EU army was planned. EU laws supersede British law decided in the parliament. Those laws were not decided by an electable body that our people could vote out at an election. EU courts overturned British judges in decisions taken by our courts of law frequently. The open borders policy has led to immigration levels being 10x what the government predicted into the UK, tacitly approved by government because it has slowed the aging of our population and helped to keep demand for housing high (and by extension maintain our sky high housing prices which are now unaffordable to average youngsters). Worse our generous welfare state attracts people from all over Europe. Rising numbers of workers creates poor working conditions for the average bloke, giving rise to zero hour contracts and falling wages in real terms.
The single currency has decimated economies of large swathes of the EU (spain, portugal, greece etc) whilst other countries have grown rich (Germany).
I voted leave for the primary reason of retaking our national sovereignty back and allowing our parliament to set our laws or repeal them. This was a vote from the average joe to stop uncontrolled immigration and retake control of our labour force, whilst halting the slide towards an unaccountable unelected United States of Europe.
I doubt we have created a Domino effect resulting in the dissolution of the EU, but if another major country such as France, Spain or even little Greece leave the single currency then the project is dead. There will be great resistance to further referenda in EU states after this shock
EDIT: One further macroconomic point. This may mark the beginning of the end of globalisation and destruction of the Western economies in terms of hollowing out the middle class and destruction entirely of the working class. Protectionism is coming. War may follow.