It's probably a good idea to lay off the heavy bench presses for awhile. When the pain has gone away do some exercises to strengthen the rotator cuff and the posterior delts.
For the rotator cuff, hold a light dumbell in each hand with your upper arms parellel to the floor and your lower arms hanging down. Bring the weights up in an arc in front of you while keeping the upper arms in the same position (they just rotate). Kind of hard to explain, maybe someone can post a picture.
For the rear delts do bent over flyes.
Using dumbells rather than a barbell for your presses can help also because you have to use more stabilizing muscles to control the weight.
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