Taurus,
I honestly don't know how to answer your original inquiry because love is a different experience for everybody. Some people will think that love means you think about the person 24/7 ( obsess much?) and be concerned about the well-being.. but you can do that with your family, pets and good friends.. does that mean you are in love with them as well?
Love could be defined in so many different ways so there is NO right or wrong answer to the question of "How do you know you are in love?" because there is so many different ways to find that out.
I have discovered my soulmate so I know the true meaning of love and I have seen one friend who is fighting really hard to save his own marriage and is not going to give up.
How do I know that I am in love?
~ The warm and tingly feeling I get whenever I look or think about my boyfriend
~ The fact that he went the distance to keep me safe, warm and loved and me doing the same for him.
~ The fact that we had so much problems to the point where we literally got divorced, me moving back to Maryland repeatedly but we end up getting back together every single time
~ The fact that after I found my boyfriend (and ex-husband), all other guys' face becomes a blur (aka not cute, hot or appeals to me) and I only want to be with my boyfriend for rest of my life
~ The fact that I can sit in the silence with boyfriend for more than 10 minutes and feel really comfortable with that (with others, I usually feel the need to fill up the silence with chatter)
Brendan might annoy me on daily basis but most of those annoyance is mixed with amusement because Brendan do things WITH reason. He keeps things interesting and is constantly surprising me with things.
So I do know for sure that I am in love...
But Taurus, from reading your posts.. I do not think you are in love with the said Libra guy but who am I to judge your feelings? If you don't feel any passion or love for the Libra guy.. then I recommend that you let him go and tell him that you will not get into a relationship with him because it won't be fair to YOU and him both. If he persists, then just stand your ground and do not let him sway you UNLESS you feel like you DO love him but you just need some time to think things out
I hope you find the answer to your question