This is a legitimately good point. The idea of a so called eternal love can be really negative for someone's life, particularly if the other person is in another relationship or just doesn't want them anymore. I admit that perspective can be a bit different for Scott, since death is a revolving door for the X-Men. Even so, keeping him pining for Jean or close to her when she's with someone else would be awful. Being close to an ex can really hurt and we already had a pathetic Cyclops who couldn't get over Jean in Tyke. I think another relationship would be good for Scott, but he really needs to get all the JEEEEEEEEAAN out of his system first. And whoever he dates should not be written as a stopgap while Jean doesn't dump Bishop or whoever she ends up with.