Most Helpful Guy
I wouldn't worry about it too much if you two are very devoted to each other! Trust is something that takes a long time to earn and it sounds like he's been very loyal to you for these past 3 years. Why would he have any desire to cheat on you now if you're relationship with him is healthy? It could be that he's preoccupied and hasn't had the opportunity to text or FaceTime you comfortably. I'd say it's one thing if he hasn't texted in a few hours but if it's all day, that's a concern to address. As long as his prioritizes are straight, everything should be fine here!
Most Helpful Girl
That's not enough evidence to say he's cheating. I wouldn't be too concerned unless you have more convincing evidence