What Do You Call It?

How do you know if your in love or if your mind is just playing a cruel joking on you. How do you know if someone truly loves you or if they are sticking around because they benefit from having you in their life. I am so confused & I dont know what to think or even how to feel... In all my 29 years I have never felt this unsure of myself. Do I hand my heart over & free fall...OR do I keep it locked away to make sure its never broken. Sadly I blame my father for this feeling, a girl is supposed to learn unconditional love from her father and mine bailed & ignores me as if it was some fault of my own, So if he cant show me he loves me how can I expect any other man to fall?  What do you call this feeling?