i feel guilty but i dont feel that i should

my stbx does not pay support.  he signed an agreement, his job has not started 2 take the money out and in the meantime hes given me nothing for a month and a half.  we still have a joint acct.  his paycheck is deposited into that acct. 
i talked to him about his lack of support and his only response was that he has his own bills and he forgets to pay. 
i decided that i shd go into the jnt acct and pay the support.
i felt it was a moral dilemma but not a legal one.
he sd that he wld pay it.  he says that every wk and then pays nothing.
i decided that i wld give him until 4 pm on monday 2 do it and if he didn't i wld pay myself from our jnt acct.
i struggle now after the fact with that decision.  i worry that it will make an already antagonistic relationship worse and that God is not pleased and that is why i feel guilty.  that God has a plan how 2 get him to do it on his own and i just stepped bet him and God.  I PRAY NOT
i'm tried of going without while he doesnt.  i figured eventually his j0b will start taking the money.  what dif does it make if i do?
i also wonder if my feeling of guilt has nothing to do with God and is a wmn who is still loving someone and does not want him to be mad.