How do I get him back or whatever?

How old are you? Because if you're over 16 (so it's believable) you could text him saying "i would really appreciate it if you would stop contacting me because i have alot on my plate at the moment, especially with the baby on the way and having to plan the wedding and all" or something along those lines. The reason he's doing it is probably because he still likes you and wants to talk to you but doesn't know how to go about it. Make it out as if you have someone else in your life and you're in a much more serious relationship than you were with him. Then he'll feel like a fool ;)

ask him if he wants to have a little fun like the old days

**** sombody else