<human>: Can you summarize the given text in a few sentences?

Just for reference purposes, I am a 16 year old male.

My friend's relationship (we'll call her Liz) with her boyfriend (we'll call him Tom) has been going for roughly 6 months and now seems to be getting to the stage where Tom seems to be at the point where he's losing attachment.

This has only really sprung up in the past week or two but seems to be getting worse by the day. He has been ignoring her messages for up to an hour (he has been active on the app during this time) and it is starting to get to her. She has called me crying at night asking me what to do but it's starting to get me down as I see her as a sister and I detest to see her in this state. During these calls I tell her what I have to say, but this has occurred a number of times now and I have ran out of advice. I seem to be repeating myself. I know it may all be down to us being naive and inexperienced 16 year olds but I really care about her well-being.

However the reason I am posting this here is because she seems to be getting into these 'fights' with her boyfriend but then the next day or even hour it seems they are back to normal as they used to be and I was wondering if this behaviour is normal in relationships as I am too young to really get a grasp on what serious relationships (ones over the length of 6 months) are actually like. The thought that I may be looking into the situation too deeply has occurred to me, the thought that her emotions may be exaggerated due to our hormonal teenage bodies has also occurred to me has also occurred to me. I really do not know what to think.

Again, any advice would be greatly appreciated. Thanks.
<bot>: My friend has a relationship which seems to be heading on the downhill as her boyfriend is being an ass but I really do not know what to think.