Confused!!!!!!! 😣😖😭

My boyfriend was always telling me how he isn't ready for a baby, he's not ready for a baby. I didn't force the issue. Then suddenly, in May, he tells me he's ready for a baby! I'm excited, right? Well, now he's telling me he's back on the unsure side of the baby fence. I asked him what suddenly changed his mind and he's like I'm scared. I tell him everyone is scared at first with something new, but after a while, everything falls into place and it works out. The thing is, it's not the first time for him! He has a 3 year old son already with another woman! So now it's got me thinking he just doesn't want a kid with me... I've brought this up with him and he always just sighs and says he does want one with me, but not now.... I don't understand... Am I just being paranoid?