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

Hi, Reddit. Long time lurker, first time poster. 

Vague Backstory:
She left her other ex because he was an asshole and she really liked me, so she wanted to take a break from relationships for a while until she sorted things out.

Flash forward: She still likes me and we're now dating (although she won't make it official and introduces me as 'her friend' still).

Flash forward 2: She and I are now in a sexual relationship, but she still introduces me as her friend. She tries to break up with me because I haven't declared my major. I logic her into not being stupid for the time being. We take a break for a couple weeks, but she decides she wants to continue 'dating'.

Flash forward 3: She quits talking to me. I keep trying to figure it out, because I actually like and care for this girl. I finally get to ask "What happened?" and "Why aren't we talking?" and receive: "I dunno. I moved on. Bye."
1 week later, she's dating some new guy.

In all honesty, I should have seen it coming (there were lots of warning signs, looking back.) but should I warn the new guy?
<bot>: over the course of 4 months Derpette leaves Herp, fills me with hope, breaks my heart, leaves me for Derp. Do I warn Derp?