Most Helpful Guy
Job changes are stressful times so, if all of your misgivings stem from his very recent behavior, it may not be significant. And, if that is what's going on, suck it up and be a supportive girlfriend because guy's notice that stuff.
If you want to find out whether it's the end, maybe you should suggest that you two go out of town together for a weekend. It's short notice, but this weekend would be a great time for that.
A weekend alone should answer your question. Either you will reignite the spark or you will realize that the flame has been extinguished.
Most Helpful Girl
Waaaaay overthinking this, big time.