broken marriage...

so my aunt n uncle have been together for like 45 years or 44. anyways since I was like 7, in 23 now, my uncle started to accuse my aunt of sleeping with a Latino man she worked with. ( im writing this post BC they helped take care of me growing up,and I care). My aunt y'all is a sweet shy lady. my uncle is a rough tough drunk. my aunt worked in landscaping and my uncle did different things in another states never understood the job title. so he would be gone weeks sometimes months at a time. they never fought untik he started working. and it was the same thing everytime, my uncle would accuse my aunt of sleeping with this man. they had 2 children who passed away together in a car accident back in 2000..well this year about a week before the anniversary party. my uncle was away at "work" when I young Latino boy showed up at my aunts house looking for John. my uncle. my aunt said he was away on business n wouldn't be back till February 5th. well the boy asked if she was a couple with John my aunt of course was very confused. well to make a long story short my uncle had another family in Kentucky and had 8 kids with this Latino. women. my aunt is heart broken and doesn't know what to do my uncle was her whole life. n now that has been taken away. im only 23 and can't give her any advice. ..please help