If you don’t ask, the answer will always be no. At least if you ask, there’s a 0.0001% chance you’ll get an answer. As said previously, people are as forgetful as you are; sometimes they’re busy, sometimes hiring isn’t their priority, sometimes things get lost. Point is, there could be many legitimate reasons for not contacting you so it’s worth a shot.
What’s the worst that can happen? They’ll say no and now you’ll have “closure”. I can’t recall of anyone who ever said “I was about to give this guy a job, but he followed up too many times so I got annoyed and gave it to someone else”.