Is it normal to cry when thinking of my boyfriend?

Is it normal that when I think of my boyfriend I cry? I absolutely adore him and feel as though I'd do anything for him. He makes me so happy and we've good an bad times and come out the end of our bad times stronger for it. We've been together for about 5 years and when I think of living life apart from him I feel so sad. Is it normal that I occasionally glance at him while he sleeps for like 5-10 seconds. I knew when I met him I loved him. And considering I have always been nicknamed the ice queen for my cold, detached, often unloving nature, towards anyone but my absolute family, I feel weird about just how much I do love him, is any of this normal?? I know it's a stupid question but I guess I'm struggling to know what to do with my emotions, and going with the flow mentally is not my thing. I'm a total thinker. Thanks guys so much!