Complete message from Alex:
"Hey... I know it's late, but I really need to tell you something. It's about what happened last month. I've been thinking about it every day and I can't keep it to myself anymore."
The truth is... I should have told you this weeks ago. When we last met, I wasn't completely honest with you. I've been going through something difficult and I didn't know how to share it. But you deserve to know.
I've realized that hiding things only makes them worse. What happened last month wasn't your fault - it was mine. I was scared and I handled it badly. I'm sorry for the distance between us.
I hope you can forgive me. I'd really like to talk properly when you have time. Just let me know when works for you.
Take care, Alex"