I'm a dad of 2 wonderful boys. My boys love me more than their mum and my wife never does her mummy duties.. numerous arguments happen due to this.. what should I do?

You should keep it up as a good daddy for your kids. It's not meaningful to pinpoint who's doing/ not doing your duties. If you enjoy doing things for your kids, cos you love them, that's enough. As others have highlighted, maintaining open communication between spouses always helps. Divorce is not something to take lightly. The kids will end up the worst victims.