Pretty much ever since they met.
Sure, they were probably in love or whatever at some point -- they did get married and have a baby together, after all -- but things have never really been easy between them.
Remember how much they would fight over anything and everything? Literally just any old thing?
It was bad
But although there was a lot of bad blood between them, they managed to put aside their issues last year for the sake of their son, Lincoln.
At some point, it even seemed like they were forming a pretty solid friendship.
Or at least they were before Briana DeJesus came into the picture.
When Javi started dating Briana last fall, his relationship with Kailyn pretty much fell apart. There was drama between the two of them, and between Kailyn and Briana.
Again, it was bad.
Unfortunately -- or let's be real this was probably best for everyone involved -- Javi and Briana broke up earlier this month.
It wasn't a terribly dramatic breakup or anything. The big issues were that he wanted to settle down and get married again, and also that she planned on getting more plastic surgery and he wasn't cool with it.
But still, they're no longer together, and so it seems like he and Kailyn are able to tolerate each other once again.
So are they tolerating each other enough to give love one more chance?!
Javi appeared on Kailyn's podcast this week, and they touched on the subject of a possible reconciliation in the future.
You know, because it worked so well the first time around.
"I just think that there's a lot of history between us that neither one of us will ever let go," Javi explained.
"Even if we were to try again in the future it wouldn't work because I know the type of person I am and the type of person she is. We argue. It just wouldn't happen."
It's interesting because while he admitted that things would never work out between them, he did say "if we were to try again in the future."
When are these two crazy kids going to get it together?!
Kailyn confirmed that their love just is not meant to be, saying that "Javi argues out of passion. Javi is a habitual arguer and a 'never letter goer.'"
"I couldn't have said it better," she told him. "I don't think we could get back together."
They both agreed that being on Teen Mom 2 definitely played a hand in the downfall of their marriage, and thankfully Javi admitted that jumping from one Teen Mom to another probably wasn't the best idea.
"I'm trying to learn from my mistakes and not repeat those mistakes so moving forward, I'm not gonna mix that," he said.
What, was he thinking about landing another Teen Mom next before he came to this realization? Should Leah Messer be on the lookout?
It actually sounds like he's still a little hung up on Briana.
"I don't know what the future holds," he told Kailyn about his most recent ex. "There is a lot we have to discuss and talk about before we make any other decisions."
"But if we do get back together, I would hope we can all get along."
Fat chance, buddy.
"It would never happen," Kailyn replied. "We would never get along. You allowed her to disrespect me to my face, also on camera, also in text messages."
"When I said what I had to say in a nice way you defended her and not me. We raise a son together, you don't raise a son with her."
There's that good old bickering we know and love!
Look, is there any real chance that these two will ever get back together?
Yes, honestly. It definitely could happen -- there seems to be some unresolved feelings there for sure.
But is there an even bigger chance that they will go back and forth between being friendly and being ridiculously, hilariously petty for the rest of their whole entire lives?
You bet your bottom dollar.
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