I think it says more about your attitude to porn and maybe feelings of rejection.
I was talking to a friend of mine yesterday whose marriage ended last year. No sex. He got fat. She got turned off. She was very Church-y and religious at the time. They stayed together as worried about shame and judgment from their respective families. Limited experience for her up to that point. (She's nearly 50 and only kissed four men ever.)
She mentioned that her husband was open about watching porn and masturbating. She could not process and thought it was dirty and disgusting.
I tried to suggest to her that it was her that viewed it that way and not everyone feels that way. My now wife once asked me "where I learned to fuck like that?' and I replied "Well, I haven't but I watch a lot of porn!"
Masturbation is a really private and intimate thing. It's right up there with pooing in terms of something people like to keep really private and NOT talk about. Most of the women I've slept with never admitted to it. I've always been open about it. I tried to talk to my GF about it when I was 15 or 16 and she was horrified but curious. She kept pretending that she didn't know what it was somehow. I think upbringing is a big part of it.
You were asleep and he wanted the release so he wanked himself off.
My wife asked me to masturbate in front of her the third night we spent together. She wanted to watch me make myself climax so she could use the same technique. I'd come from a 'deadbedroom' relationship at the time and tbh I was nervous at her request but also turned on and quite relieved by it. You have to put yourself out there in a barest way possible. So I popped down my shorts and began to play. She was turned on and then joined in. We reached climax at pretty much the same time. It was very intimate and did bring us closer together.
We were able to talk about porn. She hadn't seen much. We watched some together. Sometimes it can be foreplay. Sometimes it can be some sexy sounds in the background. It can also be a bit awkward as well. Alone you can get turned on by it quite easily, but watching with another you can see how fake it can be and it can feel like less of a turn on.
Watching someone masturbate next to you can be amazing. It's truly intimate but it takes a lot of build up of trust to get to that point.
Like the earlier poster said to get past it you have to accept it, or encourage the interaction by saying "OMG you should have woken me up, because that would really turn me on to watch you!"
Trust me, it's a big step for him to do that, especially if you were tired out. If you can both be open about masturbation then it can be amazing. There's no need to hide it from the other person.
If you really want to push the limits, try buying him a Fleshlight and maybe you can use that with him for the times you don't want PiV.