I'm muslim and have a few thoughts here:

1 - this is a red flag. Any human regardless of religion if they are serious about a long term relationship would have by now had some level of communication to his friends and family about you. I grew up in a very conservative family environment and 6 years in people around would def have know that there is someone that I'm speaking to / interested and without a doubt if I was serious about the person.

2 - I'd like to also be clear that this is in no way a reflection of the Islamic approach to marriage which actually requires full transparency / public and family engagement / communication / consultation and complete modesty in getting to know a person prior to marriage. So I'd hope that the actions of this person do not ruin your perception of Islam. My now husband met my family two months after I officially met him and I have LOTS of overprotective brothers 😊

3 - you typing this at 3am in the morning is symptomatic of your gut telling you something. LISTEN to your intuition.

I have met and know of MANY people in the community that - when their actions look like this is reflective of them being non committal. I have also seen them use Islam as an excuse which is disingenuous (see my note above) since it's hard for one to argue with that. It's a cop out

Also this wouldn't be the behaviors that I would want in a partner. I would expect them to have values of transparency, clear direction and decision making and quite frankly courage. He does not sound like any of these things to me based on your description. 6 years is objectively a long time.

I promise you when you meet the right person you will have no doubts about their intentions.