As much as I'd have a degree of sympathy given that you're in a marriage that is not meeting your needs, yes, it's clearly cheating. In practice, you've got three options. First, separate and then end the marriage. Second, get counselling. Third, talk to your husband about it and the possibility of him agreeing to you getting your needs met elsewhere. The third one isn't straightforward and probably needs a bit of the second in it for it to work, but it may be an option. Either way, you want to actually address the issues in your marriage. Finding intimacy elsewhere is really only burying your head in the sand, and isn't a solution.