How to know he’s the right one

I’ve heard a lot about people saying. The guy changes right after the pregnancy.

What are some tips or Red flags I should pay attention too.

What are some things you wish you had noticed, but were blind to it.

I’m just curious, I don’t wanna have kids then break up. That’s all I see around my city .

Pregnant mothers don’t even talk to the dad anymore & that’s scary. Already having drama & the kid isn’t even here. Or

They barely know each other. Or Only known each other for 2-6 months. (I had a Co-worker, she didn’t know her bd at all. She was with him & found out his information by sneaking and checking his Car Registration).