How do you know

You CAN'T know after only one date. They have to be interested in you to have gone out on a date with you in the first place but that doesn't mean that after only one date they are ready to fully settle down and make the relationship they have with you exclusive. I would wait until about your 5th date then bring it up on conversation. Ask them what they consider your relationship status to be and if they would like to make your relationship exclusive or if they would like to remain dating other people if that is the kind of relationship you had in the beginning. Hope this helps.

Someone agreed to go on date with you, I think is ample sign in itself, that you are being liked by that fellow. Allow some more time..to yourself to judge that person, hopefully you will get an idea, how sincere is the fellow towards you and how keen he/she is for cultivating relations with you.

simple... i know from the way she looked at me... just see her eyes...

This is a hard question to answer, but I guess I would say is, did he show an interest in learning more about you and what you like to do? Your likes and dislikes? Was there any signal of an intention for another date, or even a simple, can I call you soon? How did you end the date? Was it pleasant or a cold goodbye, thank you it was nice but thats it?

Plan your love journey. 1 date didn't measure anything. It's just a scratch on the apple flesh. But you had passed the gate, so the journey is still long ahead until you reach the gate of New Life (Marriage) together. Never feel satisfied when you have done the earlier phase dates. There are more we still need to do along to keep your relationship in a good maintanance. The hardest part is to share, to understand, and tolerable each other. Many youth lover couple stuck after cannot pass this path, and they separated at last. When you had bring her to next step of Marriage life, then you already know the 1st level of her feelings towards you. She is ready for you and what you have done past time pre-marriage had convinced her enough to choose you as the guy of her life. This is what parents always remind me. "Kid, your journey is still long ahead."

When they text message or call you as soon as you get home telling you how much fun they had and how they want to go out on another date with you. When they smile more often and laugh even at the corniest jokes you can come up with. I think it would be pretty obvious during the date whether a person likes you or not. You can see it through their actions. Like, if you're at a restaurant, if the girl goes to the bathroom. If she takes more than 5 minutes, then she doesn't like you and is trying to stall the time. But if it takes less than that, then most likely, she just fixed her make up to look good around you.