Why is he ignoring me?

So I have been hanging w my ex for like 2 months now and we have agreed we are exclusive. We hang out almost every day and on the days we don’t hang we don’t talk at all. So this week he hadn't asked me to hang in 2 days which is fine but it feels like things are getting more serious so it’s starting to make me uncomfortable. Then on the 3rd day he texts me and says “how was school, sorry I’ve been busy this week”. And I told him it’s good and that I had a good day and asked him how his was. And now he hasn’t responded to me at all. This happened last night at like 7. But that night he also lost 400$ playing poker so I’m thinking maybe he’s just mad. Help!

Why is he ignoring me?
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