I saved this as my last post for reason. I feel it is the most important.
There is more than one.
First I want to dispel a myth I used to believe until I looked into it. Parents with children on the spectrum do not have higher divorce rates, it may actually be lower.
Your significant other needs to be and is involved in the life of the child. They also have unconditional love for them, as you should have for your significant other and vise versa. Do they know this? Do they REALLY know this, or are they being treated as a spoke on the wheel? Your significant other should be the individual with which you personally feel the safest. If not - get to work on that! ASD or not, you are showing the child what love, respect, and trust mean.
Is there a sibling in the house? Have you ever put yourself in their shoes? They have needs as well. Are you demonstrating that? They may or may not get along with their brother or sister - but they do still love each other (even if you think they don't). Is the sibling holding resentment for the attention they feel they should be getting? Do they feel overwhelmed and maybe alone? Are you paying attention?
Just some things to think about, as ASD extends to the entire family unit. Are you tending to the unit or the child?