Surprised my (18F) boyfriend (19M) isn't jealous about me hanging out with my ex
Me and my bf have been dating for not too long (a few months) but we feel very comfortable together, and one of the first things I've mentioned is that I'm still friends with my ex, who I dated for multiple years.
I'm currently working at a temporary lab where I know no one, and really don't interact with people, and my ex happens to be working under the same company, so we often get lunch together, and workout together after our job. My boyfriend is currently in a different country, and will be there for the next few months. The time difference is pretty large, so I really don't have anyone to talk to during my day.
I also have a lot of male friends in my hometown, and yesterday I realized I was at my ex's house (we share a lot of the same friends, and his house is the designated hangout house) with 6 of my guy friends. I thought one of the girls would also be there, but she was coming substantially later. I realized that this situation can seem kind of sketchy, and was wondering what my boyfriend felt about it.
Everything I've currently talked about has been communicated to my boyfriend. I use snapchat to send him pictures through out the day, and talk in detail about every interaction I have with my ex and with my male friends. Again, since the time difference is so large, he tends to be asleep while I'm hanging out with my friends/ex. What surprises me is that he feels no jealousy at all, to the point where everyone else I talk to is also surprised, including my boyfriend. He says it's because I make him feel safe, but I'm still kind of confused about the lack of jealousy, and just wanted to hear opinions about this situation, and if it's normal
TLDR: Boyfriend isn't jealous about time spent with ex and other guys because I make him feel safe; no real problem, just wanted to hear thoughts and opinions and see if this is normal.