How do you actually know when you’re truly in love with someone?

I’m a 23 year old male. I only been in two serious relationships one being when I was 15 and my recent one now. I only been talking to this new girl for three-four months. We really clicked together she said she loves me but I barely believe her. She’s 20 years old and to me she has a beautiful personality but I’m usually going by looks with a girl. I know that’s selfish on my end. I tell her me and her won’t be in a relationship for a few months or even a year til things straightens out. Yet I act like her boyfriend.

How do you actually know when you’re truly in love with someone?
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