What does ~ mean in text?

Since you mentioned it specifically referencing the Japanese:

The wave dash (波ダッシュ nami dasshu?) is used for various purposes in Japanese, including to denote ranges of numbers, in place of dashes or brackets, and to indicate origin. The wave dash is also used to separate a title and a subtitle in the same line, as a colon is used in English.

When used in conversations via email or instant messenger it may be used as a sarcasm mark or, in East Asia, as an extension of the final syllable to produce the same effect as "whyyyyyy" with "why〜". Used at the end of a word or sentence in text communications, it often denotes something said in a sing-song or playful voice, or similar to the use in instant messengers and email, depending on context. In some contexts, the tilde represents a lustful or exhausted sigh: "Hello there~".

There is really no way to get another person to change his emotions. "Living well is the best revenge." I realize you don't want revenge, but living a great life without him can make him think twice about you.

Read here https://tr.im/t3P0k

He might realize that you're a fabulous person to be around and that you're going to be fine with or without him. Keep in touch but in a casual friendly way, not needy at all, and he just might realize that he wants another shot with you. In the meantime, don't close yourself off to any other options.

I'm twice your age and I'd been in quite a few relationships before I met my husband. So let me tell you from my experience... if he can't maintain a long-term intimate relationship he could be a born player/philanderer. He may have had real feelings for you but he may be overly distracted by other girls/women. This is something that often does not change with time. Of course he's very young, so it could also be just immaturity. It sounds like you are a lot more mature than he is at this point. I'm just saying, if it doesn't work out in the end you may be better off because he might be the kind of guy who is always chasing other females anyway. You might meet "the one" and be glad you didn't stay with this guy, charming as he may be. He can be very loveable but it'll just be hell to have a relationship with him if he strays.

I use it when I text "pfft" e.g. pfft~

I think it is used to make something noticeable or when you try to emphasis something.

In other words: Sometimes used when IMing or on forums to denote trailing off or accentuating the final syllable of a word.

its name is Tilde.

For more follow the source link I have provided or you can wikipedia

Want to know how to get your ex back? Change yourself. Don't worry about changing other people, worry about changing yourself. Go to https://tr.im/GDCSv

Once you do that then you can start to worry about getting back together with your ex, other wise you will find that you are fighting about all the same things and getting no where. Do what it takes and I promise things will work out in your favor.

The funny thing is I came to the realization that I had to change a little too late. After I was kicked out and after I was about to lose the only things that truly mattered to me - her love. A funny thing happens when we truly love someone and lose them. We do what ever it takes to get them back. For me I had to drop bad habits that had caused not only our relationship to sour but practically every other relationship I had had in the past. Not only with women, but with friends, co-workers, family, you name it.

Which is why I say to you as my ex at the time said to me, the only thing you can do is change yourself. Work on yourself and improve on the person that you already are. Drop the negative things in your life that don't belong there and you will see all of your relationships start to take off to new heights.

it could be " unlimited" or " to be continued" or " keep in touch"