I totally get it and I wasn't trying to be judgmental. I just didn't understand. You said he wants to break up so I wasn't sure what you were looking for in terms of advice, or how his autism factored into it.
If you want to stay together then stay together. I don't jump on the bandwagon of people saying it's an automatic breakup regardless of the circumstance. If you need couples' counselling or even infidelity counselling then that's something you can look into as a couple.
I guess I'm just unsure of what types of advice you'd be looking for from us. This is a private matter between the two of you, and all that matters is what you decide through mutual understanding.
I only caution against jumping in to relationships when you have a small child because I've been there myself, with disastrous results. I wouldn't let any man or potential partner near my kids again until I've known them a very long time, in person.
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And in the end, the love you take is equal to the love you make.