If your boyfriend had melanoma, it is very important that he keep up with his skin. What type of follow up did his doctor tell him he needed?
There is always a chance of reoccurrance and if there are any changes in his moles or something that just isn't right, he should be checked by his derm.
Depending on what you consider a normal life - I have melanoma and I live a normal life. I have changed things in my life but it is still normal. The main concern is to have any life together and that won't be possible if he ignores symptoms and doesn't continue regular check ups.
Hopefully it is nothing but he should probably be checked to make sure. Best wishes to you both.