Just wondering if anyone else has been in a situation where their size caused some friction in a male-male heterosexual friendship, did they fix it and how?

Basically I had a MMF three way with a close friend and the girl he's casually seeing (they've both said that it's a very casual and almost exclusively sexual set up, would never have agreed if this was a friend's girlfriend or someone he was intending to pursue more with). They've been asking me for a while and I just gave in, she's a solid 9 and they'd said its something they wanted to try but wanted it to be with someone they knew and trusted rather than a stranger. I knew going into it that he was average downstairs because I've known girls he's been with from university days but I don't think he knew about my size

We were talking and drinking, it turned into kissing and touching and I went down on her for a while and they continued. She started to give him head when I was done eating her I pulled mine out and they were both visibly shocked. She started playing with it and became very vocal about the size being "ridiculous, not sure it will fit" etc. He seemed bothered by this and made worse by the fact at times she essentially forgot he was there. When she was giving me head it was with much more enthusiasm than she had with him, when we were in missionary she'd be scratching at my head and back and pulling me in closer leaving no room for him, when I was behind her in doggy she was throwing it back so hard he could do anything with her mouth because of the motion. He even went soft a few times and had to get himself back up. Ill be honest...the sex was incredible but I had to let him focus of her body and keep to her mouth after a while because it started to feel like he was just watching me fuck her

Things have been very tense since. We never talked daily but conversations have gotten less frequent and more stale, sharing memes/videos on socials has practically stopped and he hasn't turned up to any of the 2 gatherings our friendship group has had

Any advice on how best to approach this? Or anyone been through anything similar? I know we need to talk but I don't know if it's a situation where I let him approach me when he's ready or I just accept the awkwardness and take the lead with it?

TL:DR - Has a threesome with a friend. His girl was much more enthusiastic with me and my member. Been very awkward with him since. Advice?