<human>: Can you provide a brief overview of the text?

I'm currently 20, male, and I've been in a relationship with my SO ( 18 female ) for almost two years and the only thing I can say is that I sometimes feel the need for change.

We've been in this relationship for quite a while and to be honest I've kind of got bored of the same old story and drama she causes, I'm always there looking for her and taking care of her and I really can say that even thought I have a crush for her best friend I still like her, but the way she's becoming is terrifying me.

You can skip this part if you're not interested in any more background story: She is going to study aboard ( that's at least what she plans and she wants a long-distance relationship of which I really am not fond of.

SO's best friend is a girl that really liked long before me and my SO started dating and she's always been really nice with me even thought she had no more interest in me as I was dating her.

She's becoming really careless about the way she looks, the way she talks and recently she started gaining a lot of weight while doing nothing but complaining about herself, rolling herself in her own filth.

I really like her personality when she's happy with herself ( rarely happens nowadays ). But when she goes into her depressions in which he does nothing to improve herself she transforms into a full-time rage machine, being really mean with everybody, patronizing everybody and in a peculiar way, extremely unattractive for me.

While the idea of a sparkling new relationship attracts me, the memories of the great times I've had with my SO are still there and I'm still hoping for more of those events to happen, here's where the crash in my logic happens and would like that everybody that took the time to read my post to give me an advice on how I should proceed and how should I discuss this with my SO without hurting her.

Thank you!
<bot>: I feel things got old, and need some change, but the memories from the good times we've had are still there and keeping me here.