By letting the person who did the wrong to make amends and prove that it will not happen anymore. Trust will take time to get back or give it back. What you need is let time heal the pain that you have and tell your boyfriend that he needs to show you that it is you who he wanted. You will have some issue once in a while because of the trust issue but let him know about how you feel...
Bond mean's to have somebody's trust or to gain their trust such as bonding with your bird or pet or your girlfriend/boyfriend to have a fully connection.
If you can regain your boyfriends trust he may take you back.
If you were cheating on him then you got what you deserved. When you go with a boyfriend there is a bond and trust issue there and, if you broke that trust issue then you broke the bond and it's probably too late to rectify what you could have done. If you didn't cheat on him and he's accusing him then confront him and instead of begging for him to take you back you should be mad as hell for him accusing you of something you didn't do!
Breaking the bond of trust is difficult to earn back. If he has not taken you back by now it is possible he may never take you back because you broke that bond of trust and hurt him deeply. Only time will tell. If you really had loved him you wouldn't find a need for cheating in the first place.
I wouldn't.
Talk to him, honestly this time.
A girlfriend can trust her boyfriend by asking him if she can or be testing to see if she can. A girlfriend can set up some simple experiments by saying things that she already knows is true and then testing to see if her boyfriend is honest with her. Also, trust takes time and if the girlfriend has lost her trust in her boyfriend then he's got to get it back. Or he will be costing their relationship, big time.
you will have to earn the trust back and it will always be harder for him because he wont know if you will do it again.
This is just my opinion, but I dont think I would be able to trust again.
Cheating is the lowest form of treating someone you are in a relationship with because they trust you and once you have broken that bond of trust it is very difficult to get back. Reflect back on why you and ex left each other and then look at your boyfriend and decide who is the best person to be with. It seems pretty obvious that your ex is playing you like a fine fiddle (having a sexual relationship ... having his cake and eating it too and determined to win you over from your current boyfriend) but don't fall for it! Grow up! At least be honest with your boyfriend and tell him that you are going to break up with him.
You can't trust her anymore. Give up.
No. You don't trust him. But deal with it. Tell him you have heard stuff about him that upsets you and ask if it is true or not.