I had a fling in 2012 and got pregnant. The father was great, he always paid maintenance without issue, has always picked our son up every other weekend, and we even got on enough that we would take it son out together on days out to the zoo etc. However, for the last few months he's been really rude to me - refusing to talk, ignoring my texts, and even slamming doors in my face when I say goodbye. I've been asking him repeatedly what the issue is and he ignores me. My son then tells me that his dad has a new girlfriend and I realise that it must be her that's making him act this way. He's started skipping weekends with our son now and in 7 weekends he's only had him once. I sent him quite a stern, but not horrible, text asking basically what the heck is going on?!? And he replies that he hates me, he always has but has just pretended to like me.... for 6 years?! This has upset me so much; I spent the whole night crying. After a lot of texting back and forth trying to figure things out he has now said he only wants to see our son once a month and has cancelled the weeks holiday he had planned with him. I asked why and he just said "things change". I then said he either carries on seeing him like normal or not at all and I haven't heard from him since. It's been a month now and my son is asking when he'll see his dad next and talks about him a lot and I just don't know what to say to him. How can I tell him his dad is not interested anymore?