There is not right or wrong answer here...the answer comes from what you believe will be most helpful for both of you to make a clean start with one another. If you decide to speak with him about it, then you might start off by saying how happy you are that you are together and let him know that you were not with anyone while you were apart...you did chat with a fellow but ended that as soon as you began connecting again. I know you worry that he might ask you later on and that could present a tough space and a mistrusting one....so if it feels right then maybe proceed in the way that feels most comfortable to you and with my above thoughts. What do you think?
You have done nothing wrong. You were not together, and you were chatting with another and then stopped that when you decided to try again. See how it feels when you are together next..in person and you can go from there. This doesn't need to be bigger than it is and even if you decide not to mention it and he asks at some point you can simply say you chatted with someone briefly and stopped as soon as you both decided you were trying again. When people are broken up there can be no rule as to what you can and cannot do. This is not mistrust or infidelity.
Great plan. See how it feels and then simply say you kept the gates open and chatted briefly with someone but you ended it. simple!
I am glad you are feeling better. Enjoy the new beginning.
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