I think my mum and dad might be splitting up :(?

ok i think my mum and dad are spliting up because when i was about 7 i remember waking up at like 6am and hearing my mum and dad shouting at each other and well a few nights later my mum said ok im leaving but i have to look after charlotte so she's comming with me i was soo sad and im 12 now and they were good for a good wile but i think its happeing now because my mum was always sayin to me its not your fault what happens and im so upset and i went away for a weekend and my dads best friend was like your mum and dad were ment to be together and im going to try and keep it that way but ts not your fault you see my dad has had a problem with drink and i love him so much but i dont want him to be drinking but he got drunk one night and didnt come home and my mum has been mad at him ever since but he;s getting help but my mum wont forgive him and my mum does sometimes be a b**ch and i be cheeky back but we get on most times and i just asked this questin because my dad is on the phone to his brother and sayin whats the point of me comming home well other than charlotte and the boys and hes just went of sayin wat da f**k shoutin and i think he's away now for a drink and im so scared sometimes i cry myself to sleep but pleas help i just want them together :'(