I'm so angry

I know I shouldn't be looking at my ex's Facebook page, but I can help it. I noticed his girlfriend had went back to a previous last name. I'm assuming that's the name of her ex. Put her profile pic was still her and my ex. So I looked and on her profile pic she clearly looks pregnant. This is the ex that still messages me on Plenty of Fish and Facebook messenger on a regular basis even though I don't reply back. I sent him a message on POF but he hasn't replied back. He wasn't online. I've taken screenshots of his profile and some of his messages especially the very suggestive ones he sent the day he told me he met her. I'm so ready to send them to her. I know he'll hate me afterwards. The problem is I still love him. I wanted to be the one to make him a father. And it's my fault for not telling him sooner. He kept making me feel so wanted when we were trying to be just friends. He led me to believe we would get back together once he felt more secure in his job. I know he looks at my Facebook page because he's referenced some of my post in his messages. If he's so happy with her why message me or look at my Facebook and POF profiles?