I regret going to uni in a relationship SO much. I didn't throw myself into freshers or first year at all. Missed my bf at uni but when I went home every weekend it seemed too short and it was always hard to go back again. I didn't fully settle in either place and when we broke up I felt so lonely cause I couldn't be at home cause of my degree, yet I hadn't made any solid friendships at uni. Definitely put more effort in than he did. Probably didn't make as many friends in freshers as I could have as I had my guard up around guys especially due to the casual sex stereotype of freshers. When asked how uni was I basically lied and said I was loving it when I really wasn't.
Cue second year when I started single (broke up Jan of first year) and it seemed like a second shot. Made some great friends, was more open and confident, went out and socialised a lot more rather than holding myself back from events in favour of bad-quality Skype dates. I finally settled at uni, threw myself into societies and volunteering, got a job. In a nutshell, I've had the best year of my life so far and finally understand the uni 'experience' that everyone talks about.
I'd only advise going to uni in a relationship if you really think you'll last, and I mean really. Some couples work and I think that's really great, but don't hide behind the relationship and hold yourself back from anything cause you may regret it if it doesn't work.
This may not be everyone, but it was my first relationship etc. etc., I was naive so the way I was w/ the relationship held me back more than the actual relationship..