Should I be worried?

Celina • Hey ladies! I'm 18 years old and I'm on the app to keep track of my irregular periods and have a safer sex life 👍🏻❤️
Sooo , My boyfriend just asked me if we could have a 3 sum.. I have no idea how to react to it, i feel a little sad and unwanted because it makes me think that just us having sex isn't good enough 🙁