Why do men who are supposedly deeply in love with their partners feel nervous when discussing marriage?

I’m in a serious relationship with my boyfriend for about a year now. We’ve gotten to know each other incredibly well within this year and we’re so aligned in many ways. He adores and loves me deeply and I feel exactly the same way. I have no doubts on how much love, devotion and commitment he has for me. We’ve talked about spending the rest of our lives and building a family together. He has told his parents and friends that I’m “the one”. But when the topic of getting married comes up, he seems nervous or sheepish. We’re both in our early thirties with fairly stable jobs, although he’s unhappy about his. I haven’t felt the need to press for an answer on the topic as I’m not in a rush. I’m just wondering… Can men be truly in love with someone and want to spend their lives with their partner but have doubts on getting married? If yes, I’d like to understand what goes through men’s minds when that topic is raised.

Why do men who are supposedly deeply in love with their partners feel nervous when discussing marriage?
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