Please help me, im going out with such a mummy's boy?

You sound just like my best friend! Her relationship is exactly the same as yours but with her she has a baby with him and there's no way out. Whereas you still have a chance I don't see the point in being with him if you don't even have anything to talk about and i know you say he'll kill himself if you break up with him but in all fairness a lot of people say that but it doesn't happen besides he'll always have his mum to fall back on! You seem a really lovely girl why waste your time with such a mummy's boy when you clearly aren't happy? Break up with him and find someone who is worth your time! Good luck :)