Your husband is a cruel and wicked men. How you have tolerated being married to him all this time I really don't know!!!
I have no problems with you sleeping with other men, if that is something that you agreed to do of your own free will, once he told you that he wanted this to happen. But for him to beat you into submission, in order to force you to do something which was not your natural inclination is totally and utterly wrong. What he's doing is actually criminal behaviour, and he ought to be locked up for it.
You have come to accept what is happening to you, and now you have met someone who you actually want to have a sexual relationship with. It would serve your husband right if you left him and had a genuine loving relationship with this young guy. However, this is not what you are asking, you merely want to know whether you should continue seeing your young lover.
This is a short and sweet answer: yes!!! Carry on, and enjoy it for all it's worth, for however long it lasts. So far, since you got married, your husband is used you and abused you wickedly, now you have an opportunity to extract a small amount of joy from your life, so grab it with both hands!!!
Be careful not to get caught, as I suspect that your husband would only use this as another excuse to beat you. You were sleeping with people that he brings home, because he is doubtless being rewarded in one way or another for selling your sexual favours. He is making a prostitute of you, one way or another. I don't know whether money is changing hands, or whether he is gaining some kind of advantage in business, or whatever. But you are being forced to have sex with men, because he wants it. He is less of a husband, and more of a pimp, and is a despicable and vile person.
Whatever chance you have for a bit of happiness, you owe it to yourself to take it!!!
My own view is that you should leave your evil husband, and make a new life for yourself. Not all men are horrible, as you have discovered to yourself. You are worth somebody good in your life.