The guy says he loves her very much and she says she wants another chance and yet lots of the advice is to wind things up without making any effort! Now there may be a few perfect people around but I don't know any. It seems to me to be perfectly possible for this couple to re-build their relationship and even for it to become stronger as a consequence. It is certainly worth trying. It has nothing at all to do with one being British and another Filipino. They are both humans, with all our weaknesses. My first marriage survived for 31 years. During it my wife also had a "fling", which was painful but we talked it through and after a while it was consigned to distant memory by happier times. These things happen and I would encourage everyone to be more positive in trying to save a marriage rather than consign it to the scrapheap without effort.
