I noticed you like to like, say, like a lot. Has she rubbed off on you?
You're 9 months into a relationship, all relationships lose the spark, this may be that time. Sure her interest level has dropped but don't let that discourage you, who is she with now? YOU, thats right! Cheer up bud, I can see you're a bit insecure about this and that is causing suspicions, those suspicions alone can evaporate what sparks are left. Stop the suspicion before the suspicion stops you!
With that said, it doesnt mean try harder or do more, quite the contrary. If you want more from her, give less....odd but works. Take her for example.
Impossible is a word only to be found in the dictionary of fools.
Napoleon I