Bleh I had a post for all of this but I didn't feel like itemizing it.
A man being in love is definately different from a woman being in love. Also, love keeps redefining itself as time goes by. Ask a couple of 5 years what love is, and then a couple of 10,25,50, 65 years...ask the same question and the answers may surprise you.
The reality of it all is that a lot of people aren't capable of falling in love with someone, since they aren't cut out to be in a relationship. The sad fact is this won't stop someone from falling in love with a person of this nature. A lot of people don't realize their own selfish nature and self-serving needs, and therefore they don't realize that they aren't cut out to be in a relationship.
For me, I knew I was in love when I couldn't conceive of being with any other woman. To this day, I find no appeal in other women, sure they can be nice to look at, but pretty women are a dime a dozen. Good looks will never change how ugly someone is on the inside, and when you see who a person really is, then you'll know how ugly or beautiful they really are.
I knew my wife had issues, but for the most part she is the type of woman I wanted in my life. And yes we have our issues today, but I love her and I'm willing to spend the rest of my life working on these issues. And yes, when we are 50 years into this marriage, I think we will still have issues. But that's ok.
On the topic of love though, I thought I knew what love was. But when my children were born, I found out what true unconditional love was, it's kind of scary and amazing all at the same time.