I'm not an expert in AA stuff but I gather that the matter of making amends has some wiggle room or flexibility. Thus it may be inappropriate to make amends if doing so might be harmful to either party. The key is not to harm the other person or endanger one's sobriety or circumstances (such as a job). That said, perhaps you might consider writing your former companion a friendly letter expressing how you feel. You may never receive a reply but at least you might get it out of your mind and it may help with some of the guilt you may feel. Good luck.
W.