Its hard. When I first started dating my bf, I wasn't out to my family but was out to everybody else. I can't imagine dating while 100% in the closet. You'll want to gush about your SO. Regardless how great your relationship is, eventually you'll want relationship advice or to vent about something your SO did. Unless coming out is something you're going to in the very near future, I can't really picture it being a healthy relationship. I completely understand though how difficult it is though, especially if my assumptions about Africa's views on LGBT are somewhat accurate. On the plus side, dating can really motivate you to come out. I would have never come out to my family if I didn't feel bad for my bf and having to lie where I was going etc etc
Sure, it's possible. I've been with my SO for almost five years now and only just came out to my family a few months ago. What really helped is that my SO lived within driving distance but out-of-state and was completely out to her family. So as long as I went to her, we were free to do whatever we wanted. We kept the time she spent at my place to a minimum, in part because my family is highly conservative and in part so she wouldn't have to be closeted for me. It's hard for everyone involved but it can work.
