…this is a brilliant question.
Because in my head canon the answer is yes.
However, its not been described that way in canon so I kind of doubt that is the case. It wouldn’t be a far-fetched idea to think that they were considering we know they must have been together quite awhile and were in their mid to late 30s when they broke up.
Their disagreement over children definitely put marriage on the back burner for them, but its hard to say it put engagement there as well. They easily could have been engaged with the intention of reaching some agreement about having kids before actually ‘tying the knot’.