If you feel that you might be into him/her, and he/she feels the same way, then that probably means that you are dating...
Carries a club drags me by my hair very hairy eats with his hands grunts wearing a lion cloth Answer Demands sandwich...LOL
First, you can't be in love, even while dating. see link blow for why.
If the two have a lot in common, if the two are well happy with each other, if the two love each other, if the two barely or at least get in some "useful" fights that it could benefit them in the...
if you cannot picture your life with said person. if you feel deep connection. theres more but it is really up to you