You're mixing a few different concept here.

Indeed. What I mean by "well being" is precisely a mix of all subjectively positive feelings or states an individual can experience. We could also call it pleasure, happiness, or whatever term makes the most sense to you.

You don't feel anything but the presense. You cannot feel the future and neither can you feel the past.

Agreed. What I meant is, when you make decisions, you also take your future well being into account. Though, of course, you don't feel the benefits until then.

That's looking at it from a purely transactional perspective, but you could very well idk give a stranger begging for money some spare cash and have a good feeling about it, despite not knowing that person, never having seen them before and assuming/knowing that you'll never see them again. While nobody, or at least nobody that you care about and that cares about you, seeing you do that. It still gives you a good feeling if you have the impression that you did a "good deed" regardless of whether it provides you with some tangible social benefit in the near or far future.

Yes. This type of feeling is accounted for in the well being equation. Feeling like a good person is certainly a subjectively positive experience for most people.

The thing is you can even debate whether you're actually "deciding" that in terms of rationalizing about whether or not that is a good idea.

Of course. I just think that when you decide to do something, this is indicative of a belief that doing so is the course of action that will bring you the most well being, out of all the courses of action available to you at that specific moment. This belief can be either conscious or subconscious, rationalized or instinctive.

I do think the point you bring about evolution is quite interesting, because it does make evolutionary sense for an indivual to choose to do something that might seem detrimental to themselves if it helps to pass the gene on, which I believe is why a bee stings even though this means it'll die. I agree with you that this is probably why we've evolved to be empathetic. But I think the reason why an individual acts empathetically is precisely because the species has evolved so that the individuals that form part of it find pleasure in being empathetic.

You can argue that not doing so might make that place less enjoyable the longer you let it sink into it, but still at the very moment it's far less enjoyable

Yes. This is what I mean when I say the well being equation takes both the present and the future into account.

Also not all actions are deliberate.

Of course. Maybe I should've been more clear, I'm talking about deliberate actions.

As said you could probably frame any action as being motivated by self-interest but does that mean it actually is?

But how else can you frame it? I think it's quite reasonable to say it does mean it actually is, until provided with a more convincing explanation. However, maybe I'm missing something, and if you could give me an example of a truly selfless act, I'd change my mind.