Well, think about the future. Even if you are with him now, so what? Would he divorce his second wife? would he marry you then? Would you be still as happy as now and capable to undertake the pressure from deviating from the social norm?

Men who are 10+ older than you always know how to take care of you. It's not that they are made for you by God, but just that they learned how to take care of women from experience. You'll find it extremely normal if you fall in love with another man 17 years older than you.

I do believe in true love regardless of age difference, but think ahead and think about the future. If this is a "no future" issue, get rid of it, especially you do have a BF and you are 26. You don't have more time to risk your long-run happiness!