I think it feels worse to think he feels the same way I do.
I suspect he's still feeling as miserable as I am
But none of that stops us from feeling drawn to each other, and wanting a relationship now
I know this may be painful to consider, but it sounds to me like you are projecting your feelings of longing for a different reality onto him, and that's what is keeping you stuck.
You haven't spoken to him in months, so if you are honest with yourself, you actually have no genuine knowledge of how he is feeling right now. He may have felt sad about the relationship ending for a month or so and then started dating again. He may be living it up and shagging a different woman every week. He may even have started another relationship with someone who doesn't want kids.
You say you "suspect" he feels the same way – ask yourself honestly if this suspicion is grounded in anything other than you hoping/wishing that he not only feels the same way, but feels so strongly enough to change his mind about children.
Realistically, if it's his lack of desire to have kids that was the main block to the relationship, if he has missed you enough to consider changing his mind, he would most likely have contacted you by now. The fact that he hasn't should give you a reality check as to how he really feels.
Incidentally, you mention that your relationship with him was extremely intense. This can be a major red flag of the other person being a narcissist. Narcissists are usually very charming/exciting/glamorous and attentive early on in a relationship, and idealise you with statements like "You're the kind of woman I've always dreamed of" "I feel like we were made for each other/I've met my soulmate" etc and big hints or even promises about the future – "I could see us getting married" "We could have an amazing life together", even when they have only known you for days, weeks or a handful of months. It's extremely flattering and exciting – almost dizzying. You feel like you can't believe your luck.
But before too long, the intense excitement starts to wear off, and the narcissist seems to be experiencing doubts and excuses about why things actually can't work out for the two of you, even though only a few weeks or months earlier he was singing a very different tune. This sudden loss of attention and excitement can feel brutally disappointing and make you feel desperate to recover it.
I would encourage you to try to objectively consider your relationship as a whole. Was it truly all sunshine and roses and pure love and happiness before the sudden realisation that you were 'star-crossed' by your different desires around children? Or was there actually a mix of very good and very bad times, excitement and confusion/despair, you wishing strongly that the relationship could succeed, but feeling not-quite-good-enough and struggling to feel like you 'really knew' the other person?