He and the kids took the boat out to drop off a crab trap and “they” thought it would be nice if I went back out with them to pick it up. So... I thought about it... I thought about saying I was busy [should have gone with that] but truth is that it is such a beautiful day and I love being out on the water so I agreed.
It was a beautiful day and you love being on the water, that sounds like great reasons to agree. But.... you should only do it if you can do it with zero expectations.
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“Yep,” he says. “Just have to drop mama off at her car.” LIke it was great to have her on the boat ride but now she needs to go home. F*%$ you!!!!!!
But it sounds like you did have expectations. You've got to drop them, because every time you have them you are setting yourself up for disappointment! I think you got a little caught up in his sudden chattiness with you and hoped that it meant something. All it means is that he's trying to make sure you are still on as Plan B. Once that's established he's back to "business as usual".
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I feel humiliated. Like he can just take me off the shelf and put me back on there whenever he wants.
I can certainly understand why he made you feel that way! Just take all those feelings and put them in a handy place so that you can remind yourself why not to lapse from DB'ing when he starts sending you more false signals.
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It would have been better if he hadn’t invited me at all.
It would have been better had he asked and you said "no", because he needs to get that cold slap in the face that you are NOT Plan B.
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now I just got myself mad and sent him a text telling him he is an inconsiderate a-hole.
Don't do that, you are just reaffirming to him that you are Plan B. Positive or negative attention, it's all the same to him- attention. You've got to work on getting to a place where you just see him as a minor annoyance rather than the person that has so much control over you that he can wreck your day by simply not inviting you somewhere.