I can get endless numbers from girls when i'm at a party(college), but i'm at a loss with what to do with it. I'm not interested in relationships, and being 19 I feel it's odd going on dates with that considered. When do I text them after a party?

Also, I told this one girl I was hitting on to give me her number, and she said "ill give it to you if you want to be friends and find me interesting, but im not into hooking up" and I just said "obviously you just dont want to give me your number, so its ok" and I walked away. Was that right thing to do? Should i respond differently if it happens again?