I’m Confused, And Lost, Please Help Me Out?

my boyfriend of a month often goes away on business trips but he’s not very good at keeping in touch while away (even though he says he will).
3 days ago I sent him a text to see if he’s ok…he didn’t reply anything. After 2 days of no reply, I sent him a text from my other mobile line (he didn’t know the number) and asked him if he’s ok. He replied immediately , asked me who I was (since I didn’t write my name) and was all flirty. He texted me by calling me “sweetie” and that he can “barely contain himself with excitement”. I think he thought some ex of his wanted to re-connect. He texted around 5 times in a row without him knowing that he’s texting me.
After that I sent him a text and told him that it seems he enjoys texting random ppl but I’m still waiting for a reply to a text i sent him 2 days ago. I then revealed my name and told him I’m missing him too. He didnt’ send me anything after that.
It’s been a day of no reply and I’m heartbroken, I can’t take it anymore, I’m left hanging and I hate this feeling. I’m going to text him to let me know when he’s back so that I could get my clothes back from his flat. Will that give him the message that it’s over? I’m too good for him so I want to end all of this (if he hasn’t already!)