I need advice

I am confused. I have a pretty great guy. We have a 2 year old son together. And we are hopefully pregnant with a second *will know in about a week*. But our relationship is far from perfect. We are so different and maybe want different things. Or maybe we are just in a rough patch. For a year. But there is this guy at my work. We have always hung out together but lately he just makes me feel like him and I are more connected than anyone I have ever met. Him and I have been having innocent playful banter but now I think I want more. But I know realistically he is out of my league. I know my guy really is a great guy. And I really do love him dearly. I feel like I'm just always tip toeing around him and avoiding time spent with him...even before this other guy was even in the picture. But now I feel like it's a big deal that I actually let my heart find comfort in someone else.