My boyfriend stopped talking to me out of no where?

So as the title says, my boyfriend of 3 years completely stopped talking to me. I don't know why, we haven't fought at all in awhile we were really good or so I thought. We don't live with each other so it's not like I was smothering him or something. It's been a week and a half, and he's okay as I saw him the other day walking out of his house. I know creepy but I was worried. Anyways, the week before he stopped talking to me we were cuddling and having a good day, we haven't argued much at all. I felt happy, we had sex a lot so it's not like that was it. We seemed really good but then he stopped replying to my texts and calls. I tried going to his house a few times but he would pretend he wasn't there even when his car was. I know he's with someone else. I haven't seen her but that's usually the case right? I'm just really shocked and need closure but can't get it. I'm just venting. by the way I'm 21 and he's 25, I don't know if that matters lol
My boyfriend stopped talking to me out of no where?
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