Hi @Sa7265 
Welcome again to the forums! I just wanted to check-in and see how you are traveling at the moment? Have you found any information on the forums, or elsewhere, on support groups (for either you or himself)? Alternatively, have you found any information on forms of therapy other than CBT that might be helpful for your partner?
Given your partner seems to be experiencing anxiety around attachment to a significant other, I felt it might be worth seeking couple's counselling. This can serve to help your partner learn to manage his own attachment anxiety better, and help you learn how to respond to your partner when he is in this space. I have listed two organisations that provide such services below:
Relationship Australia: Relationships Australia is a leading provider of relationship support services for individuals, families and communities.
1300 364 277
LifeWorks: Relationship, Individual and Family Counselling, Dispute Resolution Services, Relationship & Parenting Education, Intercountry Adoption Support and more.
1300 543 396
As @Former-Member said, your partner does need your support (all partners do!). However, ultimately he cannot rely on you to manage his anxiety, nor can he be aggressive if you are not meeting his needs - plus, it is impossible to completely satisfy our partner's needs anyway! Also remember, while it is great to support him with his own anxiety, it is also just as important for you to look after yourself. Therefore, if you need support for yourself (e.g., a support group, a psychologist, etc.,), please do not hesitate to seek such support.
Hoping this is somewhat helpful, and that your situation is starting to improve. 
Kindest Regards,
Amour_Et_Psyché