I know it sounds simple, and it is...it's the execution of the simple plan that's hard.
You need to smile and be the person he would want to come back to. Right up to the moment the judge bangs his gavel on the bench.
Take the high road and be the better person. In the end, you will be happy that you did. You are the stable one and he is unstable. Same as my sitch. My DB coach said every now and then, throw in something that shows maybe I'm not so stable/predictable. Sounds like that's what you did with your "aggressive action".
So you did that - give it a day or two and see what effect it had. Monitor results. Did it bring you closer, keep things neutral, or push him further away? The answer to that question will tell how how to go forward, and what kinds of things you need to do - and not do.
Oh, and NEVER discuss the marriage with the in-laws! Remember, blood is thicker than water.