Confused

I'm feeling a little depressed on my myspace I decide because I had nothing better to do I took a look at my ex's profile. Let me explain first after I left him he went off with another girl and got her pregnant. I think they're married now too but he's now a father. I'm kind of starting to think about him again and I think I might be jealous is this a good or a bad thing? I left him for many reasons and I don't plan on going back with him. I can't I mean the thing I have with Justin I can't lose that! We're in a relationship even if its complicated thats still a relationship to me. Justin means the world to me I'd never leave him but I feel weird that all of a sudden I have feelings for my ex again. They're small feelings but it has me all depressed now. My ex's baby is really cute now it makes me really want a kid! I saw pictures of him at freehold mall with his daughter on that train he must really love his daughter he seems like he's a really nice dad and its got me going crazy now! I can't be having feelings for my ex again he's with someone else and father! I want to be a mother but I don't want to have kids with him. Why do babies have to be so cute? It makes me really want to have one but I'm still too young. One day and maybe with you know who...