First, if you find yourself having to choose between a relationship and your passion, lifting or whatever it may be, you don't want to be with that person, man, trust me. I work out every day in the morning before my family, wife and four kids, wake up. So you have to be in charge of the time you make for yourself and your woman.
I tell my wife, 'you got to realize I need to have a relationship with you AND the weights.' I will never stop working out and neither should any of you. If some girl tries to change your mind about that, leave her ass immediately.
The reason why people give up on their passions when they get in relationships is to appease their partner and because it's easier to not have to make time for both her and lifting. It's easier to be a pussy.
I went through a divorce several years ago and felt shitty for a couple months until I got fed up with feeling like a pussy and started going out more. Once you start associating with girls and dating again, you'll feel like a new man. You just need to get over yourself and get out there and do it.
Your goals--it's more important that you have them and constantly progress toward reaching them. The program you choose doesn't matter. How soon you reach your goals doesn't matter. Just focus on getting better and better and better. Make good choices and be serious about your training and you will reach your goals, period.