Is this just jealousy?

Well me and my boyfriend have been going out for 3 months. We started going out during summer and everything was perfect, couldnt be any better. When school started things started to change, He started to change in the way that he woulnt text me unless I texted him(same with calling) He wouldnt write happy faces of call me babe or baby in his texts anymore. And he just didnt act like he cared for me anymore. Anyhow, we talked about all this and he felt really and hurt that he was making me feel unimportant and unloved. So he told me he was going to change and at different. And he did, it improved. (But it has only been a day)

Last night, we hung out and someone texted me–a number I didnt know–and they were telling me how he had cheated on me 3 weekends ago with a girl named Destiny. He kept telling me how that wasnt true and I believed him.

This isnt the first time that drama has started like this. I’ve been told that hes just with me cause im “easy” and hes gonna break up with me. He swore to God that he had never said that. I believe him

SOOO MANy girls at school like him. And thats not an exaggeration. Every girl wants to get with him and I know girls are vicious and shady; they will do anything to get what they want.

Is this the case ? Jealousy and trying to break us up ?