Hi sosad :o)
As other's have said you have learnt the hard way but now you are wary and know not to rush in so quick maybe in the future.
Please stop beating yourself up over this, you know you did wrong but he is the one that's married and should feel bad but the prat clearly cares about no-one but himself. From your comment in your other thread basically all he's looking for is sex and doesn't care about who he hurts, someone like this is not a soulmate, your well rid.
I say you should treat yourself to something (clothes, jewllery, DVD, splash out a bit etc.) have a relaxing bath, bit or pampering that sort of thing and start looking to the future with that prat well and truly in the past. Thank yourself lucky you know the truth and don't feel sorry for yourself save that for his next victim :o)