help I need advice from a third party

So me and my boyfriend (let's refer to him as T) have been together a few months. He's been loving kind and even his family has told me he has never been this happy, he goes out of his way for me, and been there when I needed him. He's fallen in love with my kids and they love him, he's even said he wants to marry me. Well we were living together but due to expenses we decided that it would be best if he goes back to live with his family for a few months till we are back on our feet, ever since then shuts been iffy... He's got this friend (we will call him C) well when we first got together all he did was talk shit about me and put me down (he was jealous cause he wanted to be with me even though I never led him on) I did some lurking cause my guy told me something was off and I saw him talking to C (even though he told me he cut him out for being a dick and wanted him to apologize to me for what he said before they were friends again, he hasn't apologized.. But I saw them talking and apparently he's moving in with him in his moms house and asked him "when are you going to break up with this bitch" his reply was "not yet" C was gonna be a tenet at his T's parents house but after T moved back in. There he told me that wasn't gonna happen. Well yesterday was my sons birthday and T blew me off didn't even say why he wasn't coming or that he wasn't coming, and when I asked him he said he wasn't near his phone... Well this conversation about C and T living together happened all yesterday, when he was supposedly away from his phone. I'm upset that he's lied and let his friend talk that way about me and lied about him living there. And I am upset that his response was "not yet" instead of, never go fuck yourself, like it should be if you are wanting to marry someone... I don't want him to get upset that I was lurking but I want to know what the hell is happening... And why... We have an agreement that it's okay to go through each others phones in front of eachother and I think when I see him today I'm gonna grab it and say "let me message C and see why he hasn't apologized yet" and then I can see the messages in front of him and have a reason to ask about them.. What do you think? Or am I just being paranoid..?