Why do guys try harder with the next girl?

He basically messaged me all day everyday for like 5 months. I wanted a phone call and a visit (we would. br LDR because we lived in different states). But he always came up with reasons and I didn't want to waste my time. Our last message was me asking to see him as I'd buy the plane ticket to see him and he said "I'm stressed right now and don't want it to be a bad first time" so i left him on read and after a week he blocked me. Fast forward like 3 months later and he's talking to a new girl and after the second month he goes and visits her in the state beside mine. Before he told me he didn't get a visit from the girl he was talking to for 2 years but I feel like he could have made the effort, she was stunning seriously. I'm like hmmm you find someone who is of my same ethnicity and then go out of your way to see her. They don't have a title on their relationship, that'd be another leap for him. Was i dumb? Should I have been patient? I swear I was there for him and offered him support. He said he loved me too.
Why do guys try harder with the next girl?
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