Do you believe in Love at first sight? Or Lust?

I’ve been single for a few months now (long story, left a really toxic relationship) But something I’ve always thought about was that feeling or feelings when you first see someone. It’s like nervousness and excitement at the same time, and even though you may not know that person or may never see them again, all you focus on is them. You can imagine a whole life with that person in a few seconds… And you either make an effort to get their attention, or for that person to notice you. Or, you do absolutely nothing and that person walks away and out of your life forever, never knowing what may have been….

Thoughts?