Looking for advice.

just be you, relationships come and go, if you feel like he is beginning to become uninterested ask him about it, that's the only way, if you do it tooo late things might become awkward if something bad happens. its better to be honest rather than beat around the bush.

You have to find a way to have healthy communication. Ask him what's going on and talk about it. If he's completely unapproachable then you should really think about whether it's worth it to keep going with him. It's a pretty bad spot to be in and I hope everythin goes well.