<human>: I'm 18 years old and recently graduated high school. Due to unavoidable circumstances I'm going to probably (90%) have to enlist into the Army (not mandatory service, I'm from the US). 

I'm worried about my relationship with my girlfriend if I enlist. She knows I was going to a few months ago but I backed out when I got accepted to a college I wanted to go to. That didn't work out (financial reasons/zero communication from father in regards to "How am I going to pay for college?") so it really looks like I'm going to have to enlist.

I've been with her for 10 months and it's been a rocky road to say the least. But I love her and she loves me and we are committed to each other. I like this relationship and want to keep this relationship.

We've had fights and our own insecurities and the main issue that arises from me enlisting would be the thought of infidelity (from both of us). Me thinking the classic "GF's/wives cheat when you deploy/go to basic" and her thinking I'll cheat on her with other girls (I've never done this just to be clear).

She has depression (and so do I, I think.. not diagnosed though so take it with a grain of salt) and goes to a therapist (usually once a week, she doesn't go sometimes when she feels lazy [30 minutes away]) and throughout the very beginning showed clear signs of this (some would view our relationship as clingy [because we spend a lot of time with each other, which I like and she likes too] but I don't consider it clingy) and her parents aren't very thoughtful in handling her depression (also does not support our relationship).

I guess it comes down to trust (I lurk this subreddit a lot lol)? If so how could we both trust each other more?

Give me the gist of the text in a nutshell
<bot>: I'm enlisting into the Army. Worried about (rocky) relationship with girlfriend. Afraid of infidelity.