Here are some tips...
Start being more sexual or flirtatious with your partner than channeling it all towards your co-worker.
Once or twice in day, start a flirty chat with your spouse or call them up for a sexy talk, instead of checking up on their lunch and tea.
Switch back to your dating days and spend time impressing each other with new efforts.
If you feel you can't get them into you back again despite all your efforts, then sit and talk to them. Ask them, have a conversation and keep your bond safe.
