To break up?

I have these thoughts, where I feel like I need to end things with my boyfriend. I don’t know if it’s just my head and my thoughts and I’m giving into them.

This is my first relationship and I feel terrible if I do. It’s going to be kind of out of the blue and he has always been infatuated with me (I’m not bragging) he just is more into it than I am. I think he has always worn rose coloured glasses, whereas I’m more of a realist. We’ve been together for 2 years.

Can I ask how did you girls know it was time to end things with your SO? And how did you go about it. He hasn’t necessarily done anything I just feel like I’ve lost that spark.