I caught my ex cheating just before I found out i was pregnant. I was suss about a past female friend of his. Six months before I found a text on his phone her asking why he wouldn't text her back. we'd been together about 4 months at that stage. I told him I was snooping on his phone cause I don't trust any male with good reason and he wasn't mad just said she was a past friend but he thinks she's looney and doesn't have anything to with her now. Six months later when I was snooping again I found that he's rung her number. So I rang her and she says she was with him 2 weeks ago and that's the only time she's seen him for the last year and she slept with him then. I was devastated but am really glad now that I snooped cause I'm no longer in a tragic, totally pathetic relationship. I'm a single mum and am having a great time while he's devastated still now 4 years later that he's lost me and doesn't get to live with our son. So if you want to know just snoop around and all the signs will be there right in front of you. A bit of advice don't snoop unless you really want to know cause chances are if you are suss they are almost definitely cheating. All of my close male friends cheat- every one of them and they all admit it to me cause they know I wont tell their partners. All their partners are suss & all ask at times and all my male friends deny it. I think it's safer to stay single.