Thanks for your question.
I understand your situation, can you tell me what it is you need to know?
Thank you for clarifying the issue.
He may have been sincere. Often when men break up with women, they may soon after have regrets. Unable to express this directly, they may, under the influence of alcohol, make an effort to reconcile and get back together.
However, such a response under the influence of alcohol lacks commitment.
You should have a sober conversation with him. Such a conversation should be without alcohol by either of you for a full 48 hours before (if possible).
Without speaking to him directly, I will not be able to known with 100% certainty of his sincerity, and without a sober conversation about reconciliation between you, you will not either.
It is equally possible that he was not just trying to get you back into bed, but that this is "trial" reconciliation. Ex husbands and wives, ex boyfriends and girlfriends, etc often do have a brief reconciliatory effort involving sex within the first year of a break up. Whether this goes anywhere will depend on the out come of a sober conversation.
For now, I would recommend to set up a dinner date with that agenda in mind, and to not text or call him until just before the date (to confirm and remind him).