He only had sex with here
Only he can answer your question: there is no standard.
it is a gift
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It means to carry though and complete what you promised to complete. For example, if you paid back a loan, then you fulfilled your promise. If you promised to help someone with a project, and did follow through and helped that person, then you fulfilled that promise.
If you mean someone's PC, someone will eventually turn into the name BEBE'S PC Hope I helped :)
A Kappa Diamond is what is known as a frat "sweetheart." This generally refers to someone who isn't in the organization officially, but does support them.
A promise ring can mean it is a promise that one day you will receive an engagement ring, but, things could have changed and it could be simply a promise ring of friendship forever and you need to have him clarify what he means by giving you that ring. If you do not love this young man and he has romantic intentions then do not accept the promise ring.
It could mean that you have pestered him or have had sex, so he gives a generic "some day" promise to you so you will leave him alone. This is not something you can bank on. Someone who is truly interested will have similar interests as you do and getting together for a date will be definite.
To do what you said you would do
Yes, all three phrases convey the idea of fulfilling a promise or commitment made to someone. They essentially mean the same thing, emphasizing the importance of following through on one's word or agreement.
"A diamond in the rough", is an old saying meaning that with a little improvement(s), you could reach perfection.