Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
There is no objection in Shariah if the period of engagement extends for a long period. It is also permissible to marry a woman who lives in another country if all the conditions of a legal marriage are met, such as the approval of the guardian of the bride or of his representative, the Mahr, the witnesses and the agreement of the bride and bridegroom. After having completed the marriage contract the consummation of the marriage could be delayed.
Therefore, we advise you to complete your marriage contract and then you become his legal wife and all that is allowed for a husband and wife becomes lawful for you too.
Allah knows best.