I see. I think i will try waiting because i don't have the option of propose a relationship when i talk to them, just the normal talk, flirt, hangout/date options. Thanks for the reply!
With dating, having there phone number makes it easier, getting into a relationship "dating", you can do in person when bumping into them. Yo can also ask to hangout or go on a date in person too.
If you're character is polly, you can ask to be in that kind of relationship too.