Jealousy is a very important weapon if you want to get your boyfriend back. Acting as if you do not care when he leaves and going out with other boys in his presence might jolt him to the fact as to what he has lost and may make him come back to you. Another method is to slowly build up your relationship from scratch by starting again with friendship and then taking slow steps to further the relationship.
You can also use your own methods to remind him of the very nice times that you might have experienced together so that he starts yearning for those times again and wants to get back with you. But remember that there is a possibility that he might be really not interested in you any more so know when to call quits and don't overdo things in such a way that it would become hard to even remain cordial with each other.
You can also use your own methods to remind him of the very nice times that you might have experienced together so that he starts yearning for those times again and wants to get back with you. But remember that there is a possibility that he might be really not interested in you any more so know when to call quits and don't overdo things in such a way that it would become hard to even remain cordial with each other.