When I was going through my PPL my ex-wife didn't want to know what I was doing and certainly did not sympathise with my flying achievements - NFT,GFT etc
My view is that she found flying is expensive, so I was spending money that she felt I should be spending on us (ie her priorities)
Secondly flying is a selfish activity. Although she may support you in other activities, women find flying a really difficult rival - they might be able to deal with an affair, but they don't know how to deal with an obsession like flying.
The indifference is a warning sign for you. You do need to talk it out now, otherwise you will find she will treat your flying as a cause for divorce - not incompatibilty but adultery!!
I've been divorced for 10 years as a result of misunderstanding women's attitudes. I recommend getting it sorted asap.