house after marriage

hi new here, my partner has an hopefully soon 2bx wife who we know will be after everything, can she claim on our house which we have just bought even though they were seperated almost 5 years ago, will he have to pay support for her, she is pregnant so we've heard to a new boyfriend and is working, there are no kids involved, they were married 18 months living together prior to that for 2 years.
Also we have found out that the FMH that they lived in and were in the process of buying in his name, she carried on after they were seperated bought the same year within a few months, and sold the year after, we are unsure whether this was puchased in his name, is he liable for any debts in it or able to claim money back, he did the house up paid the rental arears and the debts that she had
thanks cheryl