<human>: Hi there.

As the title says, my ex-boyfriend went back to his ex-girlfriend. 

But before that let me just say **we dated for 2 1/2 months and then were FwB for 3 months**. He was my *first bf* and I was in love with him the whole time; *he was cold almost from the beginning*. His lack of interest lead to a mutual break-up. 

Towards the end of our FwB thing, **he basically told me he still had feelings for his ex-gf** *who had hurt him deeply* (left him for her ex). 

That didn't really sink in.... **until his ex-gf became single recently and they're apparently back together.**

Now it's dawning on me: **I really loved someone who was in love with someone else the whole time**. And now they're finally back together - he's probably radiant. **I was simply a break from her, a distraction.** This... has been awful for my self esteem, I feel like sh-t.

I've been crying so much, I'm so sad and don't know what to do.

Can you condense the text into three sentences or less?
<bot>: ex-bf went back to ex-gf who he never stopped liking. I realize I was merely a break.