
Is he losing interest?

Hmmmm. Him taking longer to reply wouldn't necessarily be a bad sign because life happens, as you said. But the part I'm a little concerned about is him only replying to everything you said, with no questions, no wondering about you.
I think if you see this pattern more and more, or he takes longer to reply to you more and more, then that would be a definite sign that he's losing interest, yeah. Just keep observing a little more.
You've been talking for a month and a half and you've only gone out a couple times? He doesn't sound very interested in dating you. Sounds like you're friendzoned
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It sounds like you're overthinking, just based on what you wrote here. Maybe your next move should be trying to arrange another date.
Not necessarily, maybe something is bothering him, but he doesn't yet feel comfortable enough to be vulnerable with you