Don't let a bad week turn into a bad month.
You lost your workout buddy (sucks!) which means you lost your accountability to someone. You know that what works best for you is having a person there with you to work out. Or maybe they just remind you it's time to go to the gym or something. Try to find a new buddy as soon as you can!
In the meantime, do not put off your work-outs. If you have to lean harder on 3FC to be accountable to someone, then do it! If you have to check in daily or find someone who can ask you daily if you've done what you said you would, then do that! There are so many willing people here who are able to give you a nudge (even if it's not an in-person nudge) that may help until the time you find an in-person buddy.
You have not lost the willpower. You have it within you to make healthy choices. What do you KNOW you can commit to this week? Commit to it, because you know you CAN.
During these difficult times, for me, it's like I have two people in my head. The child and the parent.
The child: "I don't wanna! *tantrum*"
The parent: "That is too damned bad. You're going to anyways."
No excuses. You can do this!