brizz, I am sorry to hear of your wife's behavior. I don't understand how someone can have an affair and then try to justify it. there isn't and will never be justification. While I am 99% sure my H has not had extra-marital activities going on, there is always that hint of wonder, if he is as unhappy as he says he has been.
I too garden, it's my passion and I have seedlings under the grow light inside. I had bought lumber to start making my raise beds, and then my H drops the bomb on me last week. So, now I don't even know if I should build my beds and put any effort into it, because if he does decide its over, I will not be able to keep the house.