Are you currently living with your husband?
Any children in your marriage?
Is he currently abusing you? (Emotionally or physically)
Do you want to leave your husband?
Do you have somewhere to go if you leave?
Waiting is never a good idea when abuse is going on! Add to the fact if you tell his family he may become angry and may take it out on you. Never ever leave yourself in a position where he can hurt you.
Abuse is a very serious matter and you have a right to be safe without the fear of him hurting you. A real man never uses his hands on a women regardless of what is going on and your husband should know better regardless of the situation.
If you have somewhere to go I would advise you to do so. If he hits you then you have the right to file for a restraining order to keep him away from you. There are shelters as well who will help take you in if abuse is going on in the home.
I know leaving is very scary, but the reality is you are in far more danger staying with a abusive man then by leaving. As far as the new guy, make sure you do not get yourself into a position where you can become hurt. Take one thing at a time. You must first deal with your marriage before considering a new relationship.
Your first step is to get away from your husband in a safe environment then you can begin the process of a separation and or divorce. Once your marriage is over you can consider the new relationship.........just do not jump into anything to quickly.
I just want to close up a couple of loose ends here. Can you answer the following questions.
Where are you located? (You mentioned London but I want to make sure)
Is your husband Muslim as well?