.... has your boyfriend seen B5 before? If so, what was it that he liked about it, which got you to agree to watch it with him?
As to taking some time to get into it, I can understand. Heretical as it may seem to others, I had a hard time getting into the show at first. There was a great deal of set-up, of getting to know the characters, etc. But once that all came together at the end of Season One, I dove into it enthusiastically.
I advise you to check in with The Lurker's Guide To Babylon 5
. It's an excellent reference which can help you nail down characters and plot points, while keeping you from being spoiled on future story points.