It would be a good idea to speak to a Solicitor because you would then have facts rather than supposition.
I hope his parents remain amenable post separation but they may not be to you due to their own loyalty to their son.
Guilt can also stem from the belief that you’ve failed to fulfill expectations you or others have set. Of course, this guilt doesn’t reflect the effort you’ve put in to overcome the challenges keeping you from achieving those goals.
Some common causes of guilt include:-
surviving trauma or disaster
conflict between personal values and choices you’ve made
mental or physical health concerns
thoughts or desires you believe you shouldn’t have
taking care of your own needs when you believe you should focus on others.
Guilt can provoke some pretty harsh self-criticism, but lecturing yourself on how catastrophically you messed up won’t improve things. You might have to face some external consequences, but self-punishment often takes the heaviest emotional toll.
Instead of shaming yourself, ask yourself what you might say to a friend in a similar situation. Perhaps you’d point out good things they’ve done, remind them of their strengths, and let them know how much you value them. You deserve the same kindness.
People, and the circumstances they find themselves in, are complex. You may have some culpability for your mistake, but so might the others involved. Reminding yourself of your worth can boost confidence, making it easier to consider situations objectively and avoid being swayed by emotional distress.
I would also suggest you contact a BACP registered therapist.