If my ex-husband files bankruptcy, will it affect the past due spousal support he owes me?

No. Past-due spousal support is not dischargeable in bankruptcy. Bankruptcy is a factor in getting a reduction in spousal support payments, so he may be able reduce or eliminate any future spousal support payments to you. This of course would require full disclosure of all financial data and he must show proof to the court that he is unable to financially provide such support. Some judges have issued a temporary halt on support, to be resumed at a later defined date. This solution is used to allow the payor to get back on his or her feet financially.