It is never boring for me to go through long details of people’s relationship issues; in fact that’s my work.
If you are going with him then you are accepting to stay as a second. You must be aware about your status as a second. Legally you can not get any rights as a wife. Do not think of today, think of 10 years after. Where you and your status will stand (financial, social, personal etc.)? His regular visits to you are going to decrease as he will grow older, while your need for companionship is going to increase with age. His insecurities in the relationship are going to increase with a time as you are 12 years younger to him. Your parent will surely take this as a shock and later they know more shocking it will be. Moreover, you should be absolutely clear on your financial securities (should be equal to his wife); you do not have to go to him every time begging for your share. It may sound mean to you at present but believe me this emerges as one of the major issue in such relationship as time goes. He has to understand that he is having two families and has to do equal for them. Men’s Attitude in such type of relationship can change any time, so you should be prepared to face that and able to live in that insecurities.