How can I get my guy back?

This is my problem, me and this guy have known each other for a long time, we flirt, and we wanted each other but we were to young, now I’m 21 and he is 28 and we went out had some fun drank a little bit and he finally kissed me and confessed he has been wanted me for years since i was like fourteen probably even smaller and well I didn’t tell him but he is gorgeous and ive wanted him for a long time too. the funny thing is theres always been this “LUST” between us that is just unbelievable and we just cant say no. So finally one day we slept together i lost my virginity to him and he called me like 7 times the next day and we saw each other that night too we had sex and it was great, i dont know if its the way he does it to me or the lust we feel for each other, anyways we went on and on like that for like three weeks and then didnt see each other for a like a week and then the last time i saw him we had sex four times in one day anal, oral , everything he wanted i gave him and he told me he wanted to be the only one who i had sex with, that he would go crazy to know someone else touched me like he did and now i feel i want him even more everyday but now i see him less and less if i call him hell sound like annoyed or bugged by my phone calls i feel hes losing interest or just calls me when he wants to get off, i want him like that too but i also feel i love him, i want him to be my boyfriend but I’m afraid he doesn’t think like that, and ill go mad if i see him with another girl, i cant stand if he even looks at another girl, what can i do to get him back and make him love me like i do???? should i go out with someone else and make him jealous?? or try to let him go??its been 3 weeks since weve been together, and im going crazy i want him and nobody else. is it just because he was my first one??