His ex-wife cannot come after your money since she is not a partner to your marriage. If you are concerned that she will try to come after you, you can always sign a pre nuptial agreement with your boyfriend stating that all or most of your salary is not community property, thus no portion of your salary would be available to him, thus it would not be even potentially an issue with his ex.
Answered on Jul 19th, 2013 at 4:48 AM