I (23m) have suspicions that my girlfriend (22f) may have cheated on me while she was away because she has bruises that look like love bites that she didn’t want me to see. How do I deal with this?

My girlfriend and I have been together for almost two years now. While our relationship hasn't always been perfect, as a whole it is has being going pretty well. I am completely in love with her, and I'm very glad we're together. But now I'm really unsure about the direction our relationship is heading. My girlfriend went to see a friend recently for about four days. They've known each other for years, my girlfriend adores them, and they've always been big parts of each others' lives. And a quick disclaimer, I reposted this as I realised I was inaccurate in some aspects and that made it make less sense 🙂

When she came back from visiting her, I was going to stay the night at her house as we had wanted to spend some time together. We were watching a movie. I tried to cuddle her, which she normally loves and I can’t get her off me, and she pushed me away and told me to stop. I said as a joke, “So no sex for me then?,” and she swore at me. I get that maybe I shouldn’t have said that, but I was staying the night and it was just supposed to be a joke. She apologised to me later and said she was just tired, and I apologised to her for saying that when she clearly didn’t want to be touched at that moment. So I thought it was all okay. But then when we were going to bed, she went into the bathroom to change her clothes. Which I thought was a little strange, because I’ve had sex with her. I know what she looks like, there was hardly any need for that. She also slept as far as physically possible away from me, which is normally the opposite of what she does.

I dismissed it, and figured she was just having a bad day and that she was just tired. But then the next morning, I accidentally went into the bathroom while she was changing her clothes, and I noticed that she had bruises on her chest and her legs. I just pretended I didn’t notice until later. I asked her if she had hurt herself while she was away, and she asked me what I meant. I said that I noticed her legs and chest, and said I had wondered how it happened. She got annoyed at me and told me to stop being a creep and looking at her, and then said she just slipped on her friend’s rug and that it didn't really matter.

I feel bad for saying it, but I'm not convinced by that. Although I'm not a woman, I really don't see how that would happen. I don't know what I think has happened, but I'm starting to think she might have cheated on me. I don't know who with, or why, but she had started to have a decreased interest in sex with me, even before she went away. I thought it was just her hormones, because I know that can happen. But the fact that she didn't want me to see the bruises and didn't want me touching her is making me feel like she doesn't want to be in a relationship with me anymore. But I'm also worried I'm making too many assumptions, and pushing what happened might permanently ruin our relationship because she hasn't done anything.