<human>: Can you succinctly summarize the text in 1-3 sentences?

I have been dating my boyfriend Brad for three months.  We get along great and he's the funniest, sweetest guy I have ever dated. We have a great connection and there are numerous signs that he's serious about me.  I've met his parents and friends.  It's Facebook official and he openly posts about us. He makes time to see me every day despite our very busy schedules.  

He says he cares about me and I'm the most important person in his life.  When I told him that I was in love with him, he admitted that he doesn't feel the same way.  He says that he's falling in love with me, but he's just not there yet.  He says he is a cautious person. He finally said he did love me, but the sincerity just wasn't there.

After a couple of failed relationships, I am feeling like I don't want to invest in something that isn't going anywhere.  I want a partner in life.  I want to be married. Brad is amazing, but there is definitely an awkwardness between us now. Since I am generally anxious about relationships, I just can't stop worry about where things are going.

Is holding back on "I love you" a normal thing? How much of a red flag is this?  

Also, I know that me feeling insecure will turn me into a pain in the ass.  I'll be that person who is always looking for validation in obnoxious ways.  That will for sure  end things.

Tips? Coping strategies? Ways to kill of the crazy inside me?
<bot>: Boyfriend of three months is not in love with me yet, which is making me anxious.  Not sure how to cope.