1.You need to be clear with him, you are never having kids and his comments are causing doubts whether he is serious about you.

2.Have you been sterilized? If not, I recommend you consider it and say, "I have been thinking about getting a tubal ligation not because you might want kids but because I'm so sure I do not."

3.Some helpful points for him about deciding whether he wants kids:

Balanced discussion on Struggling with ChildFree Choice and Regret:
[Dear Sugar PodCast, Episode 5, starting at 19:50] http://www.wbur.org/2015/02/28/dear-sugar-episode-five

And this is a very good quote on it:

"I can tell you that you are going to have regret no matter what you decide," Merle said. She explained that if your child is screaming at 3 a.m. and you didn't get to go to your favorite concert because the baby sitter was sick, you are going to regret your decision, and if you're childfree and you are watching a movie about a compelling child-parent relationship, you will think you're missing something.

http://m.huffpost.com/us/entry/5002803

4.Because he is a fencesitter, if you haven't seen these please read them:

http://www.reddit.com/r/childfree/comments/201prv/reporting_back_from_the_other_side/

http://www.reddit.com/r/childfree/comments/325n0t/reporting_back_one_year_later/

http://www.reddit.com/r/childfree/comments/1t2y8j/wondering_if_a_child_free_so_can_make_it_work/

http://www.reddit.com/r/childfree/comments/2wkkda/hi_rchildfree_i_was_childfree_until_a_couple/

http://www.reddit.com/r/childfree/comments/17ny5y/stay_strong_childfree_do_not_be_convinced_into/

http://www.reddit.com/r/childfree/comments/2icq7c/im_a_father/

http://thoughtcatalog.com/christine-stockton/2014/07/parents-explain-what-they-regret-about-having-children/

http://www.dailymail.co.uk/femail/article-1376681/I-resent-children-stealing-wifes-love.html

http://www.dailymail.co.uk/femail/article-2303588/The-mother-says-having-children-biggest-regret-life.html

http://thestir.cafemom.com/toddler/168247/man_who_regrets_his_three

http://www.theguardian.com/lifeandstyle/2014/jul/19/what-really-thinking-reluctant-dad

http://www.confessionpost.com/20676/i-hate-being-a-parent

http://www.reddit.com/r/childfree/comments/2qyuo3/a_viewpoint_from_my_father_who_never_wanted_kids/

http://www.reddit.com/r/childfree/comments/1whk8b/childfree_fencesitter_have_a_partner_who_is/

http://www.reddit.com/r/childfree/comments/wr9q6/scary_mommy_my_daily_vaccinations_against/

http://www.scarymommy.com/confessions/

http://www.reddit.com/r/childfree/comments/2ykb7h/sorry_if_this_is_breaking_the_rules_but_this/

http://www.goodhousekeeping.com/life/parenting/a31760/balancing-mother-and-wife/?src=spr_FBPAGE&spr_id=1443_159985742

http://www.reddit.com/r/childfree/comments/31gcjf/i_was_an_unwanted_child_heres_my_warning_very/

A Childfree woman who committed suicide when her Husband and mother turned their backs on her when she was pregnant:http://www.reddit.com/r/childfree/comments/2zza59/i_just_need_to_talk_about_what_happened/

Study showing how having a baby affects your relationship:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2702669/

A parent living vicariously through the CF:http://www.reddit.com/r/childfree/comments/2ysise/living_vicariously/