No doubt about it—being in love for the first time means feeling extremes of emotion. One moment, you’re overcome with happiness at being with him, the next you’re paralyzed with fear that it could all end. Sounds like you’ve got a great guy—but that at times your imagination goes on overdrive. You get seized by the possibility that it could all come to a screeching halt at any moment. Unless he’s doing the flirt thing to the extreme, you’re probably best off relaxing a bit and letting love take its course.