EU Fam Revoked

Dear All
Asking this question on the behalf of a friend.
A non-EU citizen who arrived in the state in the middle of 2013, got married to Eu citizen in end of 2014 who was residing in the state a long time ago and exercising her rights. The application for residence card was processed in reasonable time and residence card was granted without any hassle.
Everything was fine until a letter from INIS arrived in the beginning of the year 2018 in which they requested identity documents and about the financial activities in respect of myself and Eu citizen. Eu citizen ceased work at the beginning of 2016. I notified them about the current scenario and also advised them about our intention to seek divorce due to differences.

1. Application to change the permission under section 4(7) was also refused, giving the fact that i currently hold EU fam card.
2.appliction for retention was made giving the grounds mentioned above but was refused as we are separated, not divorced.
Please note I,m not on good terms with my estranged spouse who is residing outside the state. Although, I,m working hard and paying all my dues to the state since I arrived in the state

They indicated that I,m entitled to make an application under the article of 8 of the European convention on human rights.
What are your suggestions/opinions on this?
All inputs are welcome.
thanks

Well that's your friend's only choice at the moment, all other applications have been refused. I would say go ahead and apply under Article 8 of the European Convention on Human Rights and see what happens.