did you have these insecurities before you married her? or have they just started? i too have those insecurities. i was constently questioning and testing my ex if he loved me or would he leave. but now that i successfully drove him away with those insecurities, i realized what i was doing and through therapy have learned that it's because of abandonment issues. you have to train your brain that "she loves me and she's not going anywhere." it will take time, but trust me it took time to get those insecure thoughts it will take time to get secure thoughts. good luck.
Looks like the green eyed giants coming out.
You have to get a handle on this, and throw out the "what ifs" and just live.
By the way your talking, its sounds like you might have been neglecting doing special things for her.
I can tell you that insecurities can make a person more likely that something will happen that is not in there favor.
Please trust your wife, thats the reason why you married her right?
And Im sure thats why she married you.
You always have to give your trust, and if for some reason things do happen to not work out, then it was meant to be.
Sorry, I dont mean to sound harsh.