Cheating or not

Ok so man (L) and i hav been goin for a month and a bit now but we hav been friends fora long time.

Few weeks ago he went to a youth event with some friends. That night one of his friends said that 'he was gonna break up with me for another girl(J)' apparently he gave her his jacket and he followed her around. Then I got a photo of J hugging him. I was heartbroken and one of my best friends (A) told him wat happened. He apologized sayin 'J liked him and he didnt hav anythin to do with it' I wasnt the same since

J apologized to me and we became friends. She said i could hav L and she wont hang out with him unless its with friends (and she would stay away from him.) We really clicked and we would boost our confidence up together

A week ago, I got a text from my ex (S) sayin he saw L kissing and hugging

J with friends around. The story with S is that he havent talked since and hes made fun of me and stuff and his new gf is a sociopath. So I went to L again and he said they never did that and that he loved me and only me. I asked J and she said they had hung out with friends but did nothin. Then I asked one of L's friends and he said that was a bloody lie

I dont know if S is trying to get back at me or L because he hates both of us but I dont feel like S would do somethin like this. L was very defensive and quoted 'That he would kick S's a** cause he didnt give a f**k if he gets in trouble at school. 'I dont know whos tellin the truth S or L?