Perhaps you should get a Separation Agreement in place, so you won't be responsible for his private spending?
I just cannot imagine how you must be feeling with him away with your son, and the OW!
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim