Emotional affair??

Hi,my partner and I are having problems for years he's been in denial over there existence let allow there effect on us,this all came to a head and we're now taking some time apart.He doesn't have family and so is just working and sleeping in his car.He started to speak to our mutual friend which is amazing I'm so glad he's opening up. However it's been nearly three weeks now and non of that honest open chat is being had with me yes he tells me how works stressing him and how our current situation is but practical now things non of the heart felt chats he's having with them (he's also opened up to a friend of a friend) he's had conversations on things he's straight refused with me. Even saying he didn't realise he'd upset me by it when that's a straight lie he full well knew because I told him ir broke my heart and be refused to speak to me about it.He's making out I'm jealous but tbh his behaviours making me wonder what his heads saying he says it's not his fault hw can talk to her because she doesn't talk to him like a c*nt,if feeling like of he can't talk to me but happily speaks to her about OUR relationship my hearts breaking all over again and I feel I need to leave him to it cut off and protect me.We've been through sp much and it absolutely tears me apart after all this he's not doing the good steps with me.

Please somebody she'd a little light