My son is seeing a girl he knew from high school. I think he's fallen really hard for her. He's on his phone to her for ages. He hasn't been doing things he would normally. I thought it was ok at first but as the weeks go on I'm getting worried. He has always been a hungry lad. Constantly eating like teen boys do. This half term he's snacked a bit then when it comes to tea which is usually a main meal has said he's not hungry and will get something later. He hasn't. I've spoke to him and he insists he's fine. Just reiterated my concerns to his adult sister and she's told me the girlfriend has bi polar is really needy and he's fallen out with his friends over it. How the hell do I deal with this? I don't want to go in all guns blazing and turn him against me but if his friend's can see she's affecting him badly I really think something is wrong.