Hey!

I need some type of advice , suggestions here! Okay I been in a relationship with my boyfriend for 3 years. He has 3 kids. His father has custody of the kids.. They live with his dad..well the kids mom basically dipped and moved to another state. She keeps in contact with my boyfriend dad about the kids. Lately he has been sneaking messaging her. I could see to check on the kids and what not .. but his dad has them she has been contacting the dad too.. now I’m starting to see that they seem to be “talking”. Back and forth for the past 3 years and back then I told him I don’t feel that it’s right and should only be about the kids. Which I would have respected. He doesn’t want me having any guy friends which I respect that or if I contact my ex who is he father of my child I won’t hear the end of it even if it’s about my kid. But as I was saying idk why she can’t go through his dad since he’s the one with the kid’s . He is hiding the fact they’re talking or swipe out real fast. He’s on the phone texting all day long etc.! It’s like he can’t stop talking to this girl if it’s not relevant to the kids and this is all after midnight and such !!!!!She is in a whole different state with her boyfriend, and Pregnant.. she can’t seem to respect my relationship nor can he if he doing all this behind my back! Idk why she’s messaging him every damn day!!!! It can’t be about kids 24/7 he can tell her the kids are fine why conversations all damn day and night ?! Before anyone tries to be rude on my post thing is I’ll respect the fact a man has kids. And communication when it’s relevant but I’ll be damned if this can keep going on! I wouldn’t hear the end of it if it was me ! He won’t listen ! I wish there was a way I could actually see what the hell is on his Facebook messenger but I don’t know his info I’m sure after midnight those convos aren’t about kids