When you say that you are not good about opening up, all you mean is that you cannot talk about these things orally.

There is writing.

There is art.

There is music. You can share with your partner the music that you like and yes, that qualifies as opening up.

There are books, pictures, any form of art that somebody created and through which you can bond with him. Say you read a book and talk about it, or maybe find a character who is a bit like you and tell your partner why so.

Then there is art YOU create, and it does not have to be a skillful creation.

There is an AMAZING exercise that is done in creative expression therapy. You are matched up with a buddy whom you might be seeing for the first time. You are given a sheet of paper and markers, pencils, etc. One person starts drawing. When she is done, the buddy draws. Then back. At some point - this is the amazing part - BOTH PEOPLE SIMULTANEOUSLY decide that the drawing is complete.

You can play this game with your partner without going into a formal art therapy group.

I distrust 12 step programs (and, they have very poor support in evidence) and would rather go into art therapy or creative expression therapy. You can go alone or with your partner - you will benefit either way.