ex best friend trouble rising .

so , my ex best friend from like a year ago just added me back on snapchat after me being blocked . we stopped being friends because i told him that his girlfriend at the time was verbally , emotionally , and sometimes physically abusive and she saw the text and blocked me on everything . she told him never to talk to me because i was “bad energy” . he later stole some of my possessions , started drama , and lied about the whole situation and said that he blocked me himself even when she confronted me about it and said it was her ... our mutual friend also just texted me and said that he wants to be my friend again . i’m not sure if i should even try and be friends with him again . he left me at a very vulnerable time and he knew it too . i told him everything . he told me he didn’t care about anything that was happening to me yet today he wants to be my friend ? i’m not sure what to do .