@madisen622
This is an interesting reversal: the stereotype is that F's just want to vent and receive sympathy, but M's tend to look for solutions, and the exchange ends in a stupid argument
Your second post suggests that you find the venting unpleasant rather than just a waste of time.
This is certainly the case with me - when I was younger I used to put up with it, but now I just tell people directly that I don't do emotional support.
So I think you have a choice to make:
a) Fake it. The appearance of NT-style "caring" can be learned, and It's quite easy to do, though excruciatingly boring
b) Be straight with your BF: tell him it's not your nature to be able to provide what he wants
OFC this can be split into smaller pieces - there are some intermediate options for (a))
The first step towards (a) is to be able to ask directly if your BF wants to vent, and to ask in a way that works for him (e.g. not everyone likes the word "vent"). Then limit yourself to asking sympathetic questions with the sole objective of keeping him talking. Don't engage your analytical faculties with whatever he's talking
about - that just distracts from the "endless NT chatter" objective.
If (b) is all that works for you, it might be the beginning of the end for your relationship. Prepare for a split before you talk about it.