I should start by saying I'm not Jewish, but I'm on here as would really appreciate and welcome some Jewish perspective :)
My younger sister (aged 19) has been seeing a very religious Jewish man for almost a year. He's 8 years older than her and he's her first relationship. He seems a lovely man, all our family seem to like him etc. All good there. He's estranged from his family for reasons that he's never really explained to my sister. All we know is that his family aren't Jewish. He embraced the faith in his late teens and officially converted. His whole life revolves around his faith.. I'm not suggesting there's anything "wrong" with this, especially as it makes him so content BUT I'm concerned about why he chose a non-Jewish and non-religious girlfriend in my sister. He talks of wanting to build a Jewish family, have children etc but where would my sister fit into all this? I know she has attended synagogue with him on Shabbat (out of respect and trying to learn more about the faith), but she's made it clear to him that she wouldn't want to convert or embrace his way of life. At the same time, she fully respects his choices, although doesn't want the same for herself.
Is is common for very religious Jewish men to be involved with non-Jewish girls? We as family like him, but I can't see this relationship lasting.