I wouldn't say Michael isn't accusing him of anything but more like testing his loyalty. Michael knows he has to level the playing field and that Tom's feelings have been hurt along the way because he feels he should be closer to Mike on all the decisions. Knowing Tom could consider the VP position from Houstan's Hotels Mike asks him if he is going to come along with him in these things he has to do. Once Tom shows his loyalty all is well again.
Have a great day!