can I get part of the company my husband started

There isn't a lot of facts to go on to answer your question fully, but here is what I think.  If he has left you in May of 2013, you can't file for divorce under abandonment until May of 2014.  If you can prove adultery, you could file for divorce now.  You don't say how long you were married, but if he started the company while you were married, you most likely could get part of the business.  While you may not be entitled to the house itself, the 100,000 he spent on it for his mistress should be counted as part of his assets so you might be entitled to some of the money he spent on it.  If it was a long marriage, he might have to pay you alimony as well.