have a connection → σχετίζομαι, συνδέομαι, δένομαι, υπάρχει αμοιβαία συμπάθεια, υπάρχει αμοιβαία έλξη, αισθανόμαστε αμοιβαία έλξη, κάνουμε κλικ, ταιριάζουν τα χνώτα μας, ταιριάζουν τα χνότα μας

[spiros]

have a connection → δένομαι, υπάρχει αμοιβαία συμπάθεια, υπάρχει αμοιβαία έλξη, αισθανόμαστε αμοιβαία έλξη, κάνουμε κλικ

we just had this connection → δεθήκαμε αμέσως

To have a connection to someone: It means you feel something for the person. It is intuitive, not based on reality, mostly fantasy because after all can one really tell if one is compatible with someone with just one date?
What does "to have a connection with someone" means in the context of dating? - English Language Learners Stack Exchange
What is the meaning of "we have a connection "? - Question about English (US) | HiNative

have a connection (with/to something)
A lot of social problems have a direct connection to alcohol or drug use.
connection | meaning of connection in Longman Dictionary of Contemporary English | LDOCE