1. Trolling social media casually, just casually.

Nothing weird, just looking at his Twitter to see if he's tweeting a lot because if he is, he's probably single and has a lot of free time to talk to me again. No big.

2. Writing "Happy Birthday" on their Facebook wall.

Whether you want to follow this up with a hilarious inside joke that shows you still know him really well and maybe he should hit you up, is up to you.

3. The "LOL, we matched on Tinder, what are the odds."

Whether he swiped you because he already dated you and thinks it's funny you matched or because you have a different hair color now and he didn't recognize you, either way, you're talking again!

4. Checking out Facebook to see if there are any girls who consistently "like" their posts.

Who the hell is Sara H? Are they dating or is she just trying to date him? Whatever. She can have him. Honestly, I've so been there, done that.

5 . The super breezy text.

"Hey man, what's going on?" This may not be exactly how you do it, but every girl around the world has some suuuuper casual "We're all just people, checkin' in with people, to see if they're single/are still deeply in love with us and writing songs about it" text they send that means way more than it seems to mean.

6. Finding something that belongs to them that they'd never want back.

"Hey Matt, it's me. I found this pen from the Holiday Inn and I'm pretty sure it's yours. Just thought I'd call in case you wanted it back. You don't still love me by chance, do you?"

7. The email that you think is low-key but is actually kind of all over the place and terrifying.

"Hey Josh, How've you been? It's so crazy that we dated and we don't even talk anymore! I mean we're adults. People do this. It's fine. I'm over it; you're over it. We both learned. So how are you?? How's your job? Seeing anyone super cute and amazing? I was seeing someone but now I'm just like, Blah, everyone sux, LOL. Anyway, TTYL."

8. The casual walk by their workplace.

Who knows if he's even working. He's probably off today anyway. And he could've changed jobs. People change jobs all the time. Oh shit, that's him. Hide.

9. The "Shit. I need to use you for a networking contact but I don't want to bring up our horrible breakup" email.

You wanna sound like you aren't still bothered by it, but 9 times out of 10, the email still ends up sounding like this: "Hey Doug, remember when I came home and you were jerking off in my sheets? Me too. So I heard you know Beth Riley, and I'd love to get an interview with her."

10. You're outside their house. Right now. You are outside their house.

No, really. I am outside your house and I will not leave. Why are you calling the police?

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Lane Moore Sex & Relationships Editor I'm Lane Moore, sex & relationships editor at Cosmopolitan.com.

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