When you are with you GF and when she leaves you fill worried but u don't know what it is,?

When you are with you GF and when she leaves you fill worried but u don't know what it is, something is wrong but u don't know what it really is u fill different when she is gone, but when she kisses you she holds you tight and brinks you close to her, why did i fill worried about something, it had to do with her, but i don't know waht it was but she likes you so much an cares for you alot alot, you are on her mind alot also. why was i worried about nothing