Will I end up divorse or separation in 2015

Hi I was born Sept1971. My wife 1980 June. Recently in 2014 we has a lot of quarrel now my wife keep saying she wants a divorce. We have 2 lovely children and we both love them dearly. She is on holiday for 3 weeks in her hometown at her parent while I'm here in UK with the kids. I'm not sure if she likes going to see someone else or to visit her sick grandmother as she mentioned.

I want to know on her return will there be still chance our marriage continues or will separation become ultimate. Will be single for the rest of my life. Also There is an opportunity to change work company with higher salary if it does become available shall I go for it. Please advice many thanks.