as far as I know its biblical to marry a widow...it was done all the time and there didnt seem to be many problems
but marrying a divorcee comes with a few problems, vengeful or hurt exes, step-children and maybe unfinished business with property, alimony, child support payment issues etc
which is why it goes to court and gets settled there...I think thats why there are rules in some countries about how long you have had to live apart for or even things like restraining orders.
Married couples who choose to separate can also reconcile. Its not really heard of for divorced couples to reconcile. Once its done, its done. You cant undivorce.
This doesnt stop people from things like...falling in love with a divorcee
Helping out a divorcee
looking after children whos parents neglect them cos they arent even speaking to each other
and remarrying someone else, often a divorce due to adultery will go off with their 'lover' and then marry them causing the other to decide its futile to reconcile and go off and find someone else as well.