Ideally, you should go to couple counselling together: it's hard to build a team if only half the players are there. If one person makes the decision to give couple counselling a try, the partner may decide to go too.
If your partner flatly refuses to join you, there are lots of things couple counselling can help you sort out on your own. There may be changes you can make alone that will have a positive impact on your relationship. Some people also prefer to have counselling on their own at first to work out their feelings before seeing another counsellor as a couple.