Hmm, yeah, if you guys were old hands at this it would be one thing, but since you're new to it and struggling, a higher level of understanding from your partner doesn't seem unreasonable at all. Plus you're not asking for much, just a basic mention of contact. Plus, he already agreed to it! I wonder why he's balking at it now. Opening up isn't always easy, and helping you be more comfortable now will benefit everyone in the long run.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.