What should I do about my boyfriend?

So hey, I'm 16f and a few months ago I asked my best friend (16m) to be my boyfriend since I knew he had a crush on me, he of course said yes and we started dating. It was all fun and games until I noticed that he would make little comments like "if you ever leave me I'll probably kill myself" or "did you know that I actually planned to kill myself but then you invited me over to your house so you actually saved me", I found it that the more he said those little comments it got me to a point where I overthink a ton about it.. Lately I feel like the love isn't there anymore and I feel the need to take a break or just go back to being friends but I'm super afraid he will hurt himself or worse.. What do you guys think?