When you say "I love you" to someone several times and they do not say I love you back. Is it such a big deal or I am just overreacting. And could it mean that she is not into me?
Well, it could mean several things and also based on the context and place you are sharing your feelings at;- 1. it could be the girl is not interested in you. 2. The girl may not feel comfortable to say words based on the period you have been together. 3. The girl just likes and therefore does not see the need to say "I love you".
You can talk to girl and find out why she does nor respond, while you are doing that be prepared for any response positive or negative.
All the best,