Open Question: Mum goes away most weekends and has sex with some guy I’ve never even met!?

My parents had always argued especially on birthdays and christmas. It was obvious they didn’t have a healthy relationship (even though all relationships have their ups and downs). When I was 11, it started getting worse, and they agreed they needed to get divorced. Dad got angry at everything, he would swear and curse in front of me and my little brother who was 2 at the time. He really upset me, and the thing I remember most is him saying that he wished I’d never been born. I also got bullied at school at the time which didn’t help, and I was basically depressed. I saw a councilor and things started looking up. After about a year my parents got divorced altogether and everything was finalized. My mums always been quite protective of me, and lectured me about the normal things, never talk to strangers, don’t talk to anyone you don’t know online, don’t have sex before marriage and so on. But when I was 13, she started internet dating, which I thought was a bit odd. She was basically going against every rule she put up for me. To be honest, she was very hypocritical. It made me really upset, and we ended up arguing a lot. She didn’t have her own computer, so she’d go in my room and use my computer, and when I’d want to come to bed she wouldn’t let me come in the room. On school nights she’d be on my computer on the dating sites talking to complete strangers until about midnight. She dated one guy, who was really nice and we met him, but after a few months they broke up. She was upset for quite a while, and I comforted her, but she soon seemed to be okay. By this time, Mum had got her own computer in her own room, so we didn’t argue so much any more. Everything seemed to be okay. Then one day, she said she was seeing some guy, she showed me a picture of him, told me about him etc. She told me she wanted to go and see him that weekend, so I went along with it, and stayed at my friends house. Then it started becoming a constant thing, of her going most weekends to this guy that we hadn’t even met yet. I asked her kindly if maybe he could come to our house for once, rather than her going to see him all the time, but she said it wouldn’t work like that. Sometimes she’d come back and say that was the last time she was going. Then the next weekend she’d be going again. It was starting to seem a bit weird so I wrote a letter to her, asking that maybe she could see someone else, that would make her happy, and be happy to come and see her, so that maybe one day me and my little brother could have a step-dad. She hugged me and agreed, but it wasn’t long before she was going away again. I started noticing that she had a short temper, and would snap at my little brother or me for the littlest of things. I stayed home by myself one time when she went away and burst into tears because I didn’t understand why she’d just keep leaving me like this. Then one day, I was looking for something in the bathroom cabinet, and came across some weird tablets. I googled the name, and sat there in shock… well not shock, I kind of suspected it.. but, they were contraceptive tablets. I mean, I know its not any of my business, but I was still a bit shocked. I started to piece it together that she was getting angry at us, because of her sexual relationship that obviously wasn’t healthy. That was the reason she couldn’t bring him to our house, because they had a lustful relationship that just involved sex. I started crying. Mum would shout at my little brother, who eventually started shouting back. I guess in his small little brain, he started to think that shouting was normal. I’d wind him up about something he’d usually laugh at, and he’d scream at me at the top of his voice. See, that’s what upsets me the most. Not just that Mums gone against her rules, once again, and having sex before marriage lustfully. It’s that it has an affect on us, because of her bad temper from it. He obviously isn’t making her happy, if she comes home crying, and shouting, and saying she won’t go back, but goes back again. If it didn’t affect our family at all, I’d totally be happy for her and her new found ‘friend’ as she calls him, but the fact is it’s more complicated than that. And I’m starting to feel depressed again, and I’m 15 now. I worry for my brothers future really. It’s only a few years before I go college or uni, but my little brother is 5, and I believe he’s being taught all the wrong things like shouting back, and most days I see him cry, because Mum’s snapped at him because he gave his crusts to the dog or something silly like that! Is My Mum doing the right thing, and should I keep out of her business, or am I right for being worried and upset about the situation?