5 ways,
1. The most easiest and simplest way is to ask directly, if you are
bold enough.
2. Alternatively, you can seek the answer you want from his/her
friends.
3. Ask your friend to ask him/her or his/her friends.
4. Follow him/her, hoping that he/she is not on the way to meet
gf/bf.
5. Know him/her as a friend first, and work from there.
Thats all I can think of so far.
