Hello, I'd like to help you with your question.
If you feel it was better for you to have no contact so you can heal and move on, then what you did
was fine to do. It is understandable that you do not want your partner to have doubts about being with you. That leaves you in a bad position. You don't know if the person is going to stay or go, or continue to have doubts. And sometimes that kills the relationship right away. Most people do not like to be "put on hold" in the relationship while the other person makes up their mind.
What you did gave both of you a definitive answer. You took the not knowing part out of the relationship and ended it before he could. That also gave you some control so you didn't end up on the receiving end of a goodbye. Plus by doing this, you allow your partner to see if moving on was the best option for him as well.
After the 90 days are done, you can always see what your partner decides about his feelings. And if you are confident that letting him back in will result in a solid relationship, then it may be worth a try. But if not, then by the time 90 days comes, you may be ready to move on for good.
I hope this has helped you,
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