That question can't be answered based on natal, composite, or synastry charts. All those kinds of charts can show is what the relationship dynamics are like, if you have a relationship (synastry chart) or what the potential is for the relationship as an entity, if there is a relationship (composite chart). They don't show whether or not one partner will commit. In any relationship, both partners have the potential to commit, but either or both of them can choose not to follow that potential. Their charts don't show their choices.
But it can be answered based on common sense. The best predictor of someone's future behavior is their current and past behavior. People who are going to commit to a relationship do it well before the two year mark, and do it clearly, without leaving their partner guessing. If it's been two years and you still have to ask if he'll ever commit, the answer is no.
You could try horary for this question, but I suspect you'll get the same answer.