If you're looking to send a light-hearted and humorous text to your ex-boyfriend, consider something that won't be taken too seriously and won't open up any old wounds. The goal is to keep it fun and casual. Here are a few ideas:
"Are you secretly stalking my online status or is it just a funny coincidence that we're always online at the same time?"
"Hey, the online world isn't big enough for both of us. Choose your territory wisely!"
**"I'm starting to think our phones have a secret pact to keep us connected all the time. Are they plotting against us?"
**"I'm convinced there's an app somewhere syncing our online schedules. It's like we're destined to be forever connected."
**"Our online friendship is getting serious. Should we update our relationship status to 'It's complicated'?"
**"Either we have a lot of common interests or the universe is playing a hilarious joke on us. Let's go with the former!"
**"I heard they are giving out awards for 'Online Synchronization Excellence.' We'd totally win!"
Remember, the key is to keep it light and fun. Gauge his response, and if he seems receptive to the humor, you can continue the banter. However, if he doesn't respond positively or if it makes either of you uncomfortable, it's best to drop the topic and move on to other conversations.