1) you will have to pay continue paying interim maintenance of Rs 5000 per month till further orders . since she is your legally wedded wife you may have to continue to pay for the rest of your married life
2) if HC has dismissed your appeal you can file appeal before SC .
3) you cant remarry during subsistence of your marriage . such marriage would be null and void
4) you cannot have live in relationship . your wife can file case of adultery against you if she becomes aware of your extra marital affair .
5) best option for you is to convince your wife for divorce by mutual consent since you have stayed separately for 24 years