What do i do?? true love or guilt? care for or die for?

8 and a half years ago i was with a guy who i was head over heals with, i would have done anything for and i guess i can honestly say was my soul mate! we split for reasons that when i look back on really shouldnt have made us split.... 6 and a half years ago i met a guy who i fell for but not really felt like i belonged wit, something was always missin we now have a son together and have been married for a little over a year, ( been together 6 n half ) in this time we have rowed constantly and i have always felt it was wrong and something was missing, i never for got the guy i was with before not a day went by where i didnt wonder how he was or where he was or what he was doin, in january this year my "husband" and i split and i was determined that this would be the last time, then about 6 weeks ago, i got back in touch with the guy i was with before, instantly i felt old feelings rise in me, i met up with this guy and as soon as i saw him i realised that the thing that wasnt right and was missin was him, i am now divorcing my husband and have started to rekindle my relationship with this guy, but still have some doubts as to if im doin the right thing, i have never been happier and everything just feels so right, i feel home, complete with him but my husband has taken this very badly, and has attempted to take his life twice. i feel so bad i have caused him so much pain and still care for him...... what i need help with is should i try again with my husband or should i follow my heart and be with who i truely believe to be my soulmate? should i let true love p me by or grab it with both hands? do i do whats right by my husband or do i right by myself and feel complete?