@millymae
I’m with Fawn Frenchie - the key point is he didn’t carry on when OP made it clear she wasn’t interested,
I would think an awful lot of men in the same situation lying close to their partner might think sex could be on the cards especially as no indication to the contrary appeared to have been given up until the point he tried. Undeniably his attempt to ‘woo’ as he calls it was clumsy and unacceptable but unless he’s repeatedly trying to have sex when OP doesn’t want it and/or OP is looking for an excuse to end the relationship then I think to do so would be a well over the top reaction.
You seem to be missing "the key point" which is that he physically pushed his penis into her her anus, without any warning or lube, "as far as he could" BEFORE giving her any chance to say stop. He didn't give her time to think, to react, anything.
You're telling me that if you woke to your partner physically pushing his dick into your anus, if or he suddenly pushed it in dry when you were expecting vaginal sex (if like OP anal sex wasn't a regular or expected thing between you) while you were fully awake, you wouldn't feel hugely violated just because you hadn't said no - even though he didn't give you a chance to?!
Dry anal, especially without warning or prep, hurts. Ask a gay guy who is a bottom. It hurts. He didn't care that it would hurt her and he also knew it wouldn't be expected as it's not a regular occurrence for them.
He likely did it because she was half asleep and so less likely to have the ability to say no before he put his penis in her anus, as far as he could, without warning or lube.
There was absolutely no foreplay involved. I had my back to him, and he was stroking it. Then his hands went lower, pulled down my knickers and pushed his penis as far as he could before I stopped him and pulled them back up.