<human>: We've been together for almost 4 years, living together for 2. Lately, she's been coming up with wild, somewhat irrational reasons to worry. 
For example, the maintenance guy at our (completely un-shady, whitebread) apartment building called last week and said he needed to get into our apartment on short notice (he didn't give us the required 24-hour notice) in order to fix a plumbing leak. I was only mildly annoyed by his announcement, but figured it could have been an emergency,  so whatever. After he had finished, she said that she was super worried that he was casing the joint and that he was going to come back and steal all our stuff, the cops wouldn't help us because we let him in, and that we'd have no recourse in the courts. Phew. And this is just one example of the bizarre worries. It sometimes seems like a new one every day.
She also needs lots of reassurance about seemingly trivial stuff, or suddenly gets worried about something she did or said in the past might have offended someone. For the most part, I've been able to help her realize that there isn't anything to get worked up over. But it's fucking exhausting and I'm getting really tired of it.
I've tried to talk to her about going to see someone about what I perceive to be her anxiety problem, but she just gets offended and refuses.
Our relationship has some other issues, too, but I am mostly concerned for her. I genuinely try to help when she asks, but I don't know what to do for her sometimes. I am frankly getting fed up with it. I feel as though there isn't anything that I could do for her that I haven't already done, like her worries are weighing me down.

To make things worse, I think I would absolutely crush her if I was to break up with her. I don't think she has much of a support network right now, either.  

Reddit, please advise.

Can you summarize the given text in a few sentences?
<bot>: Anxious GF has me worried, questioning wether or not I want to stay. Leaving would seriously hurt her. Unsure how to proceed.