How would I know ir I’m in love with someone?

I had a boyfriend who probably pushed me to use the word “love” when we were a couple. I used to think I was in love with him, but I didn’t really feel that way. I was so confused… By the way, we broke up a few months later. So I want to ask you if there’s a method, a feeling, or something I can rely on to avoid this happening to me again. Help 🥲