Most Helpful Guy
Make sure it's actually what you want. Do you know for sure whether or not he's willing to have kids with you via reversing his vasectomy or other means like surrogacy? For me and my SO, we don't really plan on having kids in the future, but in time that may change. As long as he is willing to compromise for you, then I say yeah make your relationship exclusive. Having said that, if a part of you thinks that he's not willing to have any more kids, then you're simply sacrificing that much more for him. I hope you really consider your options here and I do hope that you do make the right choice with him.