He needs to seek healing for himself, not just to satisfy the wishes of a new girlfriend.
Even though I have never been through a divorce, I imagine it is difficult to identify one clear reason for it. Depending on your interpretation of scripture, your personal experiences with divorce, and your convictions, you may not agree with the reasons.
He understands the seriousness of divorce, and he’s taking steps to heal and grow emotionally and spiritually.
However, it’s important that he begins this process he starts dating again.
A healthy purpose for a dating relationship is to discern possible marriage.