Emotional affairs and grounds for divorce

Are repeated emotional affairs biblical grounds for divorce? On several occasions my husband has become emotionally involved with other women in ways that have been seriously destructive to our marriage. The most recent incident involved a lady with whom he'd been emotionally intimate in the past. I'm tired of his betrayals, and though we've been in counseling together for some time, I see nothing in him to indicate that there's any hope of change in the future. What should I do?