Ma'am,
As I have written in my post..it is next to impossible..without a photograph and witnesses.....
And the fact is, a person is attached to a marriage (Traditional)..with sindur, mangal sutra, sacret Bangles, and jewellery...throwing party..reception and all celebrations ONLY DURING THE FIRST TIME...
After the first marriage is broken and he has suffered in the hands of the wife (498a, DV and 125.etc etc)..he does not care about all the above stuff..he thinks about leading a peaceful life with the woman he wants to..
So, unless and until he is a fool..he will not do any thing (leave pics or witnesses)..and will be very diffficult to prove whether he has married or not...he may roam around right in from of you ...you will not be able to touch him...
In my opinion the section 494 exists to instill fear in the minds of those who intent to marry again wile the other spouse in living...so that they think twice...before doing such a thing..
I am in support of those who have suffered in the hands of their legally married wives or husbands..marrying (illegally) or living together with a new man/woman....
Lady, if you have suffered in the hands of your husband earlier....and it is needless to mention that you are suffering now, you find out the man of your dreams and live happily with him...at least wait till you find your man...and then the days will be yours...
For the time being...you follow our experts advise here...and find our ways so that you get some maintenance...do something new...learn something new...plan 50 things that you will do in the days to come (visit the website www.my50.com) so that you do not regret that you should have done something worthwhile rather than running to punishr a stupid husband...
Try something new in your life...
Best of Luck
Vikram