Hmmm, So if they ask I should be cear and outright about returning for a relationship? And can that have any impact on them sending me away? like will they think I would stay when I won't?

So, I've been wondering if anyone can help me with my current situation. I have a girlfriend in the UK whom I just returned from visiting in March. now her parents are offering to pay to have me visit in june. What can I expect from immigration? How much money will I need? and what kind of questions ...