Jesus specifically allowed divorce for infidelity Matthew 19:9 (ESV) And I say to you: whoever divorces his wife, except for sexual immorality, and marries another, commits adultery. Note that Jesus does not say this is the only reason for divorce.

Is it a sin to get a divorce?

MYTH: God forbids all divorce, and divorce is the unpardonable sin. TRUTH: Scripture shows that God gives permission for divorce. In reality, Scripture shows us Gods permission for divorce in several places. It is a mercy that God gives to oppressed spouses.