It's not easy & it does take focus especially if surrounded by things that make you think negatively.

What helped me was that I left the marriage & the environment & moved somewhere totally new onto a farm I bought in the country. For me, being surrounded by nature brings out the happiness in me anyway. That move opened a door for me to see life in a positive way....even when bad things have happened. I am in a nasty divorce right now but focusing on my positive point if view is getting me through this well even though it is an across the country battle & I feel a peace in spite of it all rather than allowing my anger & regret of ever meeting him whuch would just create bitterness.