I'm really worried my boyfriend is losing interest in me. HELP!

Anonymous
im 23 and I've been with my boyfriend for 5yrs now, and recently he's been a bit quiet at times when we're together. He tells me he still loves me but he isn't as lovey dovey as he use to be. He says he's not sure if its just because we've been together for so long or if its because he's starting to get bored/losing interest etc. I really don't want to let go of this relationship. I try to give him space and we act like we normally do (i.e we still kiss and cuddle and stuff, but he doesn't do those little things), but I'm not sure what else to do to bring that spark back. is this normal for guys? or is he actually losing interest in me? his previous relationship he had was 3yrs long and he said that he got bored with their relationship and I guess when we regained contact he started to like me (we had lost contact in our junior years in high school but regained contact towards the end of his relationship when we were in yr12). what I'm worried about is history repeating itself, but just that we were able to last a little longer. please help! are we doomed to break up? is this normal for guys?

thanks in advance
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additional details:

When I noticed his quietness, I asked him a few times and he finally told me that he was worried that he was losing feeling/interest in the relationship.

On the other hand he's not sure if this is just a faze.

BUT I have been trying to think of new things to do when we go out and try to suprise him with things etc. He says it does help a little. but then there a times when his mind "runs" and all those doubts come back for him and I feel like I'm right back where I started
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I just don't know what else I can do, I'm really scared that we are headed for a breakup..
I'm really worried my boyfriend is losing interest in me. HELP!
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