"I regret dumping my boyfriend and now want him back but do not know how to go about it.
" You need to first determine what actually happened to make you dump him in the first place.
You can't change what happened, you can learn from the mistake you made.
No matter what the reason was, figure out how to deal with it so you can build a long-term commitment with him.
Be sorry about your act and let him know that you are regretting your mistake.
Your partner might not trust you anymore but do not loose your cool and patience as it is the key to win him back again.
Keep trying but do not show that you are desperate to win him back as this will have negative effects.
Apologizing is one of the best ways to get your ex back.
Say you're sorry for the real reasons for the breakup.
Stay calm and keep your emotions in check.
Don't let the discussion get aggravated into an argument over blame or other problems.
Keep the lines of communication open.
Sit down and talk out your problems objectively.
Let your partner know that you are genuinely trying to get back because you think that you were wrong and wants a second chance to prove your love again.
When you are in the process make sure that you just don't force yourself on him.
Give other person some space and allow him time to cool down as this might be a very tough time for him to deal with.
Remember you dumped him, so he's probably already trying to move on.
Winning the trust back can be a log process so do not loose hope if he loved you he will certainly give you a second chance.