Is being lesbian/gay bad?

It is not bad, no matter your orientation or theirs. But as for your question, I guess you should ask your self, what kind of person are you?

As a friend, being supportive should be the first choice. Someone coming out is a huge ordeal. There are plenty of doubts and moments of self consciousness that comes with it. Realizing who you are and the idea that many people would not accept you or would want to do you harm is a scary thought. If they came out to you, they trusted you, or at the very least, value your opinion.

They are looking for stability, let them know that you are there for them as a friend.