Is it normal to not want to talk to anyone else when you have someone else?

I'm not exclusive with this person but I am so in love with him. I haven't really come across someone else who gives the same excitement he does and at the same time, I don't want to. Right now, I'm actually talking to a huge past crush of mine and so surprised that even with that, when I see his name come up on my phone and also my guy, my guy still gives me that exciting jump in my heart and my old crush doesn't. It's funny cause of all people, I thought he would be the closest to give me that same feeling but nothing. Unfortunately, my guy doesn't put as much effort as I would like him to and then here comes my old crush who seems like he wants to talk to me and I can easily leave my guy hanging for my old crush but I don't want to. I think until my guy doesn't make me excited anymore with the most simple things, I'll always want him and no one else. Who would want to skip out on an exciting feeling like that? For sure not me because I have never felt this way before and its freaken amazing despite the struggles. It's so natural. It's not like "I SHOULD like this person because he/she is a good person." I just do. I already tried liking someone who I SHOULD because he was good to me, but it died because I never naturally liked him and had that exciting feeling for him. Although my old crush is finally talking to me, that "crush" I used to have for him is not like this real feeling I have for my guy. And right now, he's not giving me that excitement like he does so as big of a chance I have to go with him and prob should ditch my guy, I'm not cause I'm still feeling him despite the struggles.