ive been in 3 year long realtionship but ive developed feelings for another guy but i still love my bf and idk what to do because concealing my feelings for this other guy is messing with my head?

Well that you s entirely up yo you. If you wish to preserve your commited relationship, you Do "the right thing" by ignoring this distraction. THIS is one of those tests that challenges your commitment. Either you have the character of keeping your word and commitment .. Or you don't. Your choice.

Like mentioned here already .. There is a huge difference between "loving" someone and 'being in love' with someone.  I'm thinking you may not be experiencing the 'love' you want .. with EITHER party.

If you have  no major problems with your boyfriend, you back away from this other guy, and you don't hurt your boyfriend. Simple as that. Put yourself in his place.

There's a difference between loving somebody and being in love with them. Although you love the guy you had been with for more than several years, you are definitely not in love if you're falling for another man. That's called infatuation.

I recommend breaking up with your boyfriend ASAP. As there's not much you or him could do to save the relationship if you're falling for another guy.

Trust me, it's better to cut ties than to stay with a person you're not really in love with. As you could become so blind that you both begin hurting one another. And that's not a healthy relationship.

My suggestion is, date as much as you can while you're still young. You might come across the right person meanwhile.

Marriage is (believe it or not) the best way to maintain a long term relationship, providing you take commitment seriously.

In other words, you promise to maintain that long term relationship.

Married or not married, attraction to a member of the opposite sex is always possible and frequently probable.

The point of marriage is that you are not available or free to pursue those particular feelings; and the potential satisfactions you see should be (and are) obtainable from your partner, if he is also committed to you.

I am not recommending marriage.  I am just point out that choice is necessary sooner or later for growth of a relationship.

Until you can commit yourself,

committing to others is imposible.

Stay true to the person you committed to. In the end, your bf has loved you for 3 years and your just now starting to like this guy. Who knows if this guy even likes you back? Don't be a player,  stick with your bf (unless he's cheating).