NO EXCUSES: The easiest way you can exercise more is to incorporate quick workouts into your already-established fitness routine. A short series is perfect for your days off from the gym or as a burst of cardio in the morning before you start the day.
The person might not be who you thought they were; might have changed for the worse; but in the memories, they will always be the person you loved. it's ok to cherish those memories. You dont have to allow that person in your life now.