What's fair for the goose is fair for the gander?

So i found out that my husband cheated on me in our own bed while I was at work, and more than once! I am supporting us both at the moment because he's out a job, so I've been working 3 to 4 doubles a week to keep us afloat (I work in healthcare, so I can work as many doubles as I want basically). So here I am supporting us while he's out of work, and he cheats on me...in our own bed!!! And it's not like I am not here for him sexually or emotionally, I have a libido that runs pretty high so I'm always down for sex at any time! So here I am thinking to myself, you know how many times I could have cheated on you?! Now I have friends who know this great guy that has been wanting to be with me and I'm like I've never been that type, but now? I know two wrongs don't make a right but I feel like this is the biggest slap in the face I've ever experienced and he's cheated before but I forgave him and we moved past it. So should I just go for it with this other guy or should I do the "right" thing like I always do? Has anyone ever been in this situation?