Whenever I'm angry with my spouse, I stop talking and possible excuse myself to avoid saying things i could never take back.

Though this avoids problems but it may also encourage her to misbehave...Don't know if its the most effective.

Share how you successfully handle situations where you are upset.

Well done. I do the same, and as far as possible try and keep my cool. Tell the significant other why/and what made you angry. Dont be afraid to ask for a little time out to gather your emotions and thoughts. Cos, angry words once said, can never be taken back. It can cause emotional scars. If I may ask, how did you come to the thought that walking away might cause misbehaviour? dont get that....

There's the risk that she may begin to take d gesture 4 granted...like she can do/say anything and get away with it. Afterall, I'll be back when I'm calm.

Tell her that then. Then she will know its time out not the end of the matter