From the start of being with my boyfriend of 3 years I always imagine that I'm not his type. We look totally opposite, he's very laid-back hippie status and I like metal aggressive music and dress differently. He loves me and I love him, but as of lately why do I feel like later in life he'll leave me for another woman who's more his type? Every time I see bohemian-type girls or whatever I feel like, "What if he leaves me for her?" or "She looks like his type." Why do I feel this way?