<human>: Condense the text into a few key points

I broke up with her. For this post the why isn't important. Neither of us did anything drastic or bad. She doesn't hate me. The last time we spoke she expressed how much she was struggling and that I'm the first and last thing she thinks about every day.

That was like a month ago and I just found out through mutual friends she's seeing someone else. Spending heaps of time with the guy and staying over at his house most weekends etc. I didn't ask who it was because I don't want to know.

I wish I the person who told me hadn't. But they did and now I don't know what to do.

A girl asked me out on a date recently and I blew her off because honestly I'm just not ready. I can't deal with the idea of going on a date with someone that isn't my ex.

I don't have any room in my heart for anyone else yet.

And it hurts so much that she does.

I feel like our four years meant nothing to her now. How can she so easily forget about our time together? We pretty much matured from teenagers to adults together. How can she so easily replace me?
<bot>: Ex is seeing someone else after just 3 months.. I feel like I've been so easily and swiftly replaced I meant nothing to her.