Been married for 9 yrs. 8 yr old and 26 yr old from previous marriage. Living, kind of by myself, even though my husband and 8yr old live with me. Husband, I feel is just not in it anymore., except what I can do for him financially. we own our own SLOW business.
My children come 1st, though its hard with a second voice behind me all the time! Too much to detail yet. Give me a shout! Maybe its just me!!

Have you tried counseling? Sometimes it's helpful to go by oneself when there are what if's, to help you clarify your own thought processes & counselors deal with this stuff all the time/ so they can guage too probably whether you should be concerned.
Are you worried he may be cheating, or does he just seem not attentive, etc? I know marriage go thru lulls, but if you are worried about his noncommitment to you or disrespect/abuse, that's another thing.
Men are different I think anyways than women but abuse is pretty obvious.
Let us know if we can help you further here.