yes it will improve her mood
Get married when you are both sure that the relationship will last.
Not on your first date. If you get in a relationship, then tell her :)
that just depends on the girl. You should ask that, (specific girl) what they would like in a relationship, or what they would like in a woman, non-binary person, or man.
Some girl that's hot ignore the answer above you should date the girl that makes you smile and laugh when your down the one that knows most about you because if you date some girl that is just hot she might be a b**** so id advise you not to do that and with a girl that you know and get along with the relationship seems to last longer so take my advice written by a teenage girl
No. The better solution for this is to not date a guy that cheats. This is not healthy behaviour in any relationship.
the date in which the girl and the boy started dating.
it isn't but it should be illegal
No! Maybe you should talk to her, let her know that you are not as committed to the relationship as you should be. Save her the heartache and do the decent thing, end the relationship rather than break her heart by seeing other people.
as long as their relationship does not involve a sexual relationship otherwise, you should check the laws in your area to see if it is legal
you can't unless the date was nice
No. Never do that. Why force something if it won't last in the long run?
If the feelings are reciprocated, then sure. But be careful, if the relationship doesn't work out, you may lose the friendship. Ask yourself if having a relationship outweighs the friendship.