How to get letter of recommendation from current advisor if transferring PhD to another university for family reasons? I've been in engineering PhD for 6 months and now considering transferring to another university. The reason is not academic, but family -- I'm in a long distance relationship with my boyfriend. We're both serious about this relationship and plan to get married. However if I keep doing my PhD in my current university, we'll be separated for many years 

I am considering transferring my PhD to university closer to him. My questions are:


Should I contact the potential future advisor first before telling my boss I'm leaving? 
When should I talk to current advisor and how (focus on my family reason?)
Is it possible to get his letter of recommendation, or I'll screw up this relationship entirely?
will it possible to transfer to an university better than my current one? (honestly getting to a higher place is not my purpose, believe or not, but around my BF's place are almost all very good universities (1 tier higher than my current one), which actually refused me when I applied them last time. So I'm very concerned if I could be able to enter them now)


One thing that comfort me is that because I work hard, my current advisor seems have good impression on me. But I don't know whether this will help. If anyone have any ideas, would you share your suggestion?
If your advisor is generally an emotionally sane person, he should be able to understand your position. If your advisor is not, you're better off finding out as early as possible, and then to run.

That said, the right time to talk to your supervisor is right now, for two primary reasons:


As you're working in a lab, it is quite likely that your supervisor would want to hire a replacement for you, which takes time.
Your supervisor may have contacts to the relevant universities, and be able to help you moving.


When it comes to what to talk about, there are two important aspects besides your wish to be closer to your family:


You'll want to reassure him that you are not leaving unfinished things around. Wrap up your experiments as far as possible before you leave, and be available to work on manuscripts after you're gone, too.
Do you plan to take your thesis topic with you? If so, you probably should discuss intellectual ownership with your advisor. Even if you feel it was your idea, he may disagree.


Finally, is there any risk that your current lab has some "secret techniques" that you'd "hand over" to the competition? If so, try to address potential concerns.