I have torn my right pec twice. The first time I did it on floor press. The second time I came back too fast and did it on a banded speed day. I was lucky that it was only a muscle tear.
I got ART almost immediately (next day), iced alot in the first week, and continued to train stuff that didn't aggravate it.
I felt that maintaining bloodflow to the area was important so I continued to train around it. As long as it didn't increase the pain level, I kept at it. I started out with sets with the bar working up to 3x20, and did alot of upper back and lat work.
The biggest piece of advice I can give you is get in for deep tissue or ideally ART right away to break up adhesions and old scar tissue, and minimize the formation of new.
This type of injury tends to be cummulative in nature, and the pathology in the muscle that resulted in the tear is likely still present. I did ART once a week for a month, and every other week 3-4 times.
Ease back into it. The second time I tore it was much worse than the first. More painful and took longer to heal I remember not even being able to open a sliding glass door without pain.
Just because it no longer hurts does not mean it is not still vulnerable. You will probably continue to have some symptoms for a while. When that happens, back off. Period. Stretch it out gently, maybe apply some heat, and live to train another day.
Two years later, my raw bench is about back to where it was, and my shirted bench has continued to go up. I am finally able to complete a heavy raw cycle (working up to trips) without aggravating it. I can also do dips now without fear. That pec still feels balled up compared to the other side.
Use this time to work on other muscle groups that need to come up. Like I said before, ease in gradually, and if it starts to feel tweaked, back off.