"I am in deep now and I really don't want for him to break my heart again so I don't know what to do."
"He hasn't said anything to me about any feelings he may have for me still, so I am acting very casual as well."
"I just find myself thinking about him too much and don't know what to do. What do you think?"

Thank you for responding. I am gratified to hear from you personally. I was responding only to the above thoughts. It appeared to be a general question, "what do you think?", to the general population, so I expressed a cautious encouragement & wait & see attitude to it. Perhaps it was a bit too flippant to understand. My apologies.
I was taken aback at being engaged by a third party on your behalf. Being put on the defensive for stating my opinion in a public forum was not what I expected, and would have preferred a simple response from you as my comments were for you only. Had I known otherwise, obviously I would not have said a word. I will be more prudent in future.
And, I do understand quite a bit about How and Why separation/divorce/relationships have a myriad of complications, each being unique unto itself. I don't need the gory details to see you want to be there for this guy, no matter what.
It seems the loftier thoughts of marriage commitment via the promises made to each other were inappropriate here as marriage to him is not the subject. I believe, in general, marriage is taking a beating in our society. So few people are sincere in their vows to each other. I was addressing that & marriage is not what you are interested in here in your questions. I am sorry to have muddled that.
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The newness of his single state, was a little caution flag to me. Only that.

I did not mean "in the middle" between he & his soon to be ex, but in the middle of his personal emotional melting pot. It was not a determination or judgement that you need to wait until all the dust settles, but having personally seen dozens of divorces, it Always takes a little longer than you think to achieve closure with a marriage when there is someone waiting in the wings, so to speak.
It is just what I have observed, that things don't get dealt with in the same way.
For me, I would want there to be a little more space from the former life, before I declared my feelings, that's all. My opinion again.

Caution was the main thought I was trying to convey. Pardon me if I am appearing to be too thick to understand human dynamics, but I thought you said he broke your heart previously & I was commenting on that aspect.

I am thrilled for you that you get another chance with the one man you clearly want to be with. I hope you get everything you want from this situation & truly live with the happiness you seek. I hope he does too.
All the best to you.