Answer
Based on official Jordanian legal texts
No, a husband is not always obligated to pay maintenance under Jordanian law; maintenance is tied to the existence of its grounds. Article 59 of the Personal Status Law makes a wife's maintenance owed by her husband so long as a valid marriage subsists, even if she is wealthy.
This obligation, however, lapses or is suspended in situations the law specifies. A recalcitrant wife has no maintenance throughout her nushūz under Article 62, and her entitlement may be affected if she goes out to work without the conditions set in Article 61. On the end of the marriage, general spousal maintenance ends and is replaced by the bounded ʿidda maintenance set out in Articles 151 and 152.
A husband's obligation to maintain is therefore conditioned on the marriage subsisting and on the absence of an impediment such as nushūz; if the ground for the obligation ends or an impediment arises, maintenance is suspended or lapses as the case may be.
Assessing whether a ground for the obligation or an impediment exists remains within the Sharia Court's competence on the facts of each case.
This is a general explanation based on Jordanian Personal Status Law and does not replace advice from a qualified lawyer in a specific dispute.