Iphone messaging autocomplete function. Urgent help please.

Sorry I'm new to Iphone and not sure how exactly this auto-complete function works.
I know that probably some of you will try to have fun with me after saying this, go ahead I mean I can see is a reason to laugh of me but at the same can you please answer a serious answer, I really need to know this stuff, so please help me out!

Long story short this is what happened:

My boyfriend (accidentally) find out some auto-complete messages that I sent. It seems that he had a lot of free time or something but she was playing with words and now he is saying that I've typing stuff that I haven't or maybe I can't even remember. So my question is, I would assume that the auto-complete function is a "memory function" to remember you what you typed in the past, right? I mean you could combine random words and not even close that what you actually typed in the past? The thing is that he found out that this combination "i love ya boy". I really cant remember at all typing that to nobody, he is saying that the only way "ya and boy" would appear as first option after typing "i love" is if I actually typed that in the past, is this true? Probably I might had typed "love ya" but i really dont remember typing "boy" to anybody. Maybe many many years ago, I'm I doubt it.
Can you please let me know if you have this automatic autocomplete in your iphone? He owns an android so is different.

Thank you very much! Thanks a lot for your help.

 

First of all thank you for your prompt reply. I still would like to know pow does it "think" what I might type next? My BF is saying that he tried the same words on 2 of his friends iphones and that combination of words was nowhere to be found. So how can I explain why the follow up words are the way they are just specifically in my iphone?

 

Thanks again. But it's not random, whenever I type "love ya" the next word is always "boy". This means that maybe I typed that in the past? I honestly don't remember at all.

 

If that works that would prove that I actually wrote "boy" at some point. I guess I will just to admit that at some point I did that but I really cannot remember at all.

 

well i guess if he doesn't understand then he can leave or do whatever he want, not going to apologize for something i didn't do. up to him.

 

Yes

 

So basically it can be random and get random funny results. My question is more about, why my iphone would have different results (and always the same result) in contrast to other iphones?

 

sorry that was a typo. The issue is that hoe can i explain him from a technical perspective that I don't necessarily typed that to anybody.