What’s happening at the core of this is Ruth Bader Ginsburg fight for the things you care about Avengers shirt by T-shirtat that our body is releasing neurochemicals that drive us into certain actions, and since we are animals in an evolutionary sense, the body’s biological goal is survival and reproduction. ‘Infatuation’ is just a biochemical response (details here) that makes you find an attractive mate, reproduce, and enjoy the whole experience. You can’t stay away from them / keep thinking about them because of a serotonin / cortisol release, and enjoy being with them because of a dopamine response from your brain’s reward system.
Love on the other hand has more to do Ruth Bader Ginsburg fight for the things you care about Avengers shirt by T-shirtat with ensuring that your children survive until they are adults. You biologically care about your mate (who you may have kids with) because doing so ensures that your little family unit is safe. Again, it is a bunch of neurochemicals pushing you into action (more here). Long term love, attachment, and bonding have a lot to do with neurochemicals like oxytocin and vasopressin. These are responsible for adults feeling the impulse to be there for their partner, take care of children, and be social.