Hi @Strawberrylatte you said
I feel like if he is to use condoms with me will it not be as good will he lose the interest in our sex as it’s not good enough
This is really worrying. You obviously aren't confident in your relationship and you don't trust him. With good reason, based on his track record and the fact he talks about looking at 'boobies' when he's at the beach with his family. (Is he 12?). You feel you have to 'fight' or tie yourself in knots to keep his interest. That isn't how a relationship should be.
You also said you don't for certain he won't cheat or leave you as 'you know what men are like'. I know that most men aren't like that. You are with an unreliable, lying, feckless one.
Honestly, I'd forget about the contracteption issue and focus on the 'why am I with this man?' question
In the meantime, I beg you not to have unprotected sex (which the pull out 'method' is). You know you don't want another child, and it's crazy to risk that, especially with someone who you know you can't rely on.
And regarding him saying he will now have a vasectomy - he is a grown man who should take responsbililty for doing his own research and sorting it out. Turning it around - how much time did he spend doing research and booking appointments for you when you were pregnant? I'm guessing very little if none. It isn't your job to organise his vasectomy. It isn't something you're doing to him. It's his choice and his job to sort it out.