I think I was used as a trauma dump

Let's say me (A) met a guy (B) on tinder around a year back I thought we were a good match we used to talk a lot met a few times as well on dates, the guy approached me asking me whether I'd be open to something long term, I said yes but with the condition of not hurrying things up, plus he was having some issues of his own so I didn't wanna burden him with the guilty of failed relationship, but I was there by his side talking with him, listening to his issues, he eventually came out of that with professional help, once his matters were sorted suddenly I was being ignored and then suddenly one day he says he likes someone else "someone I met in person and not through apps" and then apologises to me for not saying it earlier I stayed calm most of the time even though every nerve in my body wanted to react, but still all I said was "it feels bad that all I was ever considered was someone from the app" idk I felt bad that despite standing with a guy through thick and thin and listening to his issues and slumps, I got rejected as an online alternative