They say when it happens you know, but I don't really think there is a way of telling 100%. I was with an ex for 3 & a half yrs, I thought I loved him. Towards the end of the relationship I knew I didn't because I knew I could never go off someone so much if it was love, now I'm with my new fellow I think this must be love as its much stronger than the feelings I had for the previous, but you never know!!
You think about him practically every second of the day. Everything reminds you of him. You still get butterflys when he calls even if youve been together for over a year. You still get excited about meeting up with him - even if its just to go to the shops. Just thinking of him puts a smile on your face.
Like Leanne says, you'll know if it was love. But when I loved my ex, I knew if we broke up I was feel so sad, almost like my heart would die. My first ever bf, use to be abusive towards me and I accidently kissed my male friend, and I wasnt bothered about what my bf thought. I loved my ex though, that I thought about him everyday, I would be heart broken if we broke up, if we had arguements I would be so upset during and afterwards. I couldnt think about going or even looking at another man. I feel so comfortable with him, and that if I was ever in danger I knew he would be there. I couldnt wait to see him and even felt weak at the knees when he looked at me.
You'll know when it's love. BUT, that said, love changes. What was love when we were five (that boy you adored on the playground for a week) is not love when we're 20 (that cute rock star guy you lasted 3 months with) is not love when we're 30 (the professional you ended up living with), etc. And you can fall in and out of love with people. You may love the guy you're with now but if you don't maintain it, you can lose it. Some women marry that boy on the playground and some wait for the single dad they meet in their late 40s. Just don't worry about it so much.