I have a question about a female friend.

At the time, she was a 21-year-old college student. While she was dating her first ex-boyfriend, apparently he made all of his ex-girlfriends take birth control pills and never used condoms. Around the time she started dating him, she messaged me on LINE: “Seriously, this guy is dangerous.” “He didn’t finish inside me, so I don’t think I’m pregnant, but isn’t this terrifying?” “Do you know about low-dose birth control pills?” “Unlike the morning-after pill, you just take one every day and it prevents pregnancy. They’re only about 3,000 yen a month—amazing, right? And when you take them, you don’t have to use a condom. You can do it bare.” Later, when the subject of sex came up separately, she said things like: “It just feels good the whole time.” “Honestly, it feels good when you just put it in.” I also heard that she had sex without condoms with that ex nine nights in a row. Eventually, they broke up, and when she started dating someone new, she sent me messages like: “My period hasn’t come.” “I’m taking medication that prevents pregnancy, so there’s no way I could be pregnant, right? Obviously.” “I mean, there’s no way I’m pregnant.” “But my mom keeps asking who the father is.” “Oh, my period came. It started this morning. Congratulations to me.” “As expected, medication is unbeatable.” “It’s hard whether your period comes or not.” “Seriously, no matter what I do, I won’t get pregnant.” “It’s amazing. I’m probably starting to gross people out, so I’ll stop talking about it.” “Well, I have done things that could have resulted in pregnancy.” “But everything was fine—that’s all I’m saying.” “Apparently, it’s actually difficult unless you’re really trying, so I guess it really would be a miracle.” That’s the kind of thing she messaged me. Do you think she was being finished inside? What do you think? She’s probably 27 now, but once someone has sex without a condom, does that mean they keep doing it that way afterward? Is it a habit?