You have set up an impossible situation for yourself:
On one side you've said you want to go on this trip with him.
On the other side you say you "can't handle what he's doing.
These won't work together. You have to choose and decide between them. If you want to go on the trip to the beach with him, that's fine. Do it with no commitments to the future: you're going to have a good time with someone you know how to have a good time with. Period. Like I wrote above.
But, if you really can't handle what he's doing, then you can't handle it. End of story.
You can't have both because they contradict each other and they won't work in the same reality: either you put away the problems for after the trip or you can't go on this trip with him because you'll be crying and yelling the whole time together.
It really sounds like you want to go to the beach with him. So go ahead. The problems won't disappear. They'll be here when you get back and you can deal with them then. Put them aside and deal with them then, okay?
I wish you the very best!
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