I think a good question to ask yourself is, do you Want to leave? There isn't really a should/shouldn't, but what do you want for yourself? Is there any value left in your relationship? If yes, then I would insist that your husband go to counseling with you. Talking it out with a third party might help clarify the situation. Would he identify himself as gay? bisexual? wants to experiment? He needs to be honest with himself and with you if this marriage is to continue.
If your answer for yourself is "no", that you don't find value in this marriage, you don't feel love for him, you don't choose to continue in this situation, then I would recommend maybe start with a counselor for yourself or consult with a divorce attorney to start finding out what your options are.