Hon, a guy who chooses to run instead of listening to his heart is probably very young or it's a symptom of something worse - a weak mind, instability, or a hesitancy to be in a relationship or to be in love in the first place.
Now, i think reconciliation spells can be worthwhile - i'm not saying this from the point of view of a person who admonishes against this type of work (although it's possibly THE hardest type of magical work and people are always messing it up, but i digress) - but in your instance, with your man being scared and flighty, even if you were to effect a reconciliation, i doubt the spell would be such that it would erase all doubt in his mind and he'd stay with you happy and faithful forever. Magic doesn't work like that.
If he has his fears and his doubts, a reconciliation spell is not going to quell those. At best you'll get him back for a time and then he'll do the same thing again - maybe this time running out on a marriage or abandoning you with small children. People turn their backs on love all the time.
Your best recourse, in my opinion, is to do some spiritual healing and strength work on his behalf. If you're interested, PM me and i'll send you a link.
Best of luck