The working out thing can actually be your path to happiness I feel. Even getting your partner to becoming involved is a technique to a changed life. It’s one of possibly making lemons into lemonade really. I have never been in better physical shape.
Find a book on gym movements and diet and make it your goal. If not that, use walking or Yoga to reinvent yourself, with the mind centered on improvement and physical change. It’s a system that at the first 30 days may become tiresome, but once improvements start, becomes very rewarding and a new lifestyle.
You need to slowly learn what works for you. Everyone is different and needs a slightly different routine. It may be a 3 day on, one off. It’s not a goal of massive training but finding the balance of muscle stress, and recovery. One you become in the zone you have unlocked the key to consistent success.
Centering on diet and exercise will become second nature and really very easy and simple, once you’ve learned what works. The goal should be consistency and progress. It may involve a difficult start, but will always end well. The hardest part is the beginning, but before long a well paced routine will emerge!