1. There is no evidence that your marriage was blocked by black magic and you should never surrender to this claim. Those who think that they are under the effect if black magic, get harmed even if there is nothing done against them, but they themselves harm themselves by thinking that they been under back magic.Even if there is any possibility of bad thing done against you, you can easily remove it away just by reciting Ayatul Kursi, Sura Falaq and Sura Naas after Prayers.
2. Reply on Allah's Mercy and trust that He will never let you alone. Seek His help always and supplicate and seek His support.
3. Recite this verse as many times as you can especially after every Prayer: إنَّ هذا لَرِقُنا ما لَهُ مِن نَفاد INNA HAATHA LARIZQUNA MAALAHO MIN NAFAAD (Sura 38, verse 54). This verse has great benefits in many matters including marriage.
4. Recite this Quranic Du'a : ربِّ لا تَذَرني فَرداً وَأنتَ خَيرُ الوارثين RABBI LA THATHARNI FARDAN WA ANTA KHAIRUL WARITHEEN. (Sura al-Anbiyaa', verse 89).
5. Repeat Salawaat (ALLAHUMMA SALLI'ALA MUHAMMAD WA AALI MUHAMMAD) and Istighfaar (ASTAGHFIRULLAH RABBI WA ATOOBU ELAYH) and (La Hawla wala Qowwata illa Billah).