Just as there are daily habits that build a strong romantic relationship, there are behaviors that destroy relationships as well. So, take note, and do your best to avoid these common relationship mistakes that can jeopardize even the strongest of bonds. Yes, these bad habits can ruin even an otherwise good partnership or marriage.br br Effort and commitment don’t always equal a happy union. If you and your boyfriendgirlfriend (or husbandwife) are struggling to maintain balance and harmony, then you can use this relationship advice.