You have already received some very good advice. It's impossible to help you anymore because there is not enough information here but I strongly suggest that you talk to somebody on a professional basis who can help you sort through this complicated relationship issue.
Do you have any friends and family you can call on at this time? Is destructive the same as abusive? Abusive partners have a tendency to isolate you from your support networks.
There are also other support groups that may be able to offer assistance -woman's refuge, etc. Try looking up your phone book.
As part on my treatment ages ago I was asked to learn dbt skills. They have skills, etc for dealing with different situations. They are just basic life skills.
I'm not sure of a link or web address but they have copies of Marsha Linehan's Skills Training Manual For Treating Borderline Personality Disorder on the net.
If you're in real trouble call the police.
J