How can I stop?

It sounds more like you're infatuated and obsessed with "your love" than actually loving him. In my opinion, you can't really be IN love with somebody if they don't love you back. And having such strong feelings for someone for 2 1/2 years without them knowing can come off as kind of creepy hun. As for this other guy, it sounds like he's trying to win you over because he has some competition. And he sees how crazed you are over this guy, so you're probably coming off as desperate and he's playing on that to try to get what he wants. He's telling you what you want to hear because he knows you're feeding off of it and it sounds to me like he's just trying to get in your pants. I say take some time to regroup, do some soul searching, and re prioritize your life. If you're not in a relationship with this guy, he's not gonna know or care if you're loyal to him or not, so why sacrifice your own happiness because of that? Tell him how you feel to at least get closure on this whole thing. Good luck.

You're right it is unhealthy to just want love but from a guy. Just start hanging with your girl friends or even the family. They are most likely closer to you then these to guys. Although after just chilling for a while if you still are feeling the same about this so called love of your life for god sakes TELL HIM! Nope that you love him that will freak him out just that you like him quick and simple.
now about this other guy.
the way you described him kinda freaked me out plus personally wen a guy calls me hot it sounds kinda weird that they don't care about wats on the inside.
the way he talks to you sounds like he needs to cool it a little
give you some space
anyway that's all I can say
hope I helped a little
best of luck!